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Our Team

Senior Management Team

Natalie Lender

Partner and Chief Medical Officer

Natalie L. Lender, MD is a psycho-pharmacologist and Certified in the practice of Psychiatry through the American Board of Psychiatry and Neurology. Dr. Natalie Lender received her medical degree from the Moscow State Medical University (Moscow, Russia). She later graduated from the psychiatric residency-training program at TUFTS University (Boston, MA) in 1998. Dr. Lender worked as attending psychiatrist at Bournewood Hospital located in Metro Boston, where she practiced general psychiatry and specialized in drug and alcohol addiction treatment. Dr. Natalie Lender formed Square Medical Group in 2008 and has since developed the practice into a valuable resource for the Greater Boston community. Dr. Lender’s experience includes co-occurring substance use and mental disorders. Dr. Lender also has 20 years of experience in person-centered treatment and program development. She is certified to provide Transcranial Magnetic Stimulation (TMS). Dr. Lender designs and implements patient care strategy for patients at Square Medical Group. She is most passionate about developing the next phase in integrative care for dual-diagnosis and substance abuse patients.


Elaine Stark

Vice President of Quality and Compliance

Elaine Stark, Vice President of Quality and Compliance, joined Square Medical Group in 2014. Elaine has worked for government, and both profit and non-profit organizations, in clinical and administrative positions. Prior to coming to Square, Elaine was the Executive Director at Boston Institute for Psychotherapy (BIP), for ten years and served as Chief Administrative Officer for New England Psychiatric Consultants, P.C. (NEPC) for 12 years. She brings significant expertise and experience in contract procurement and administration, program development, Federal and state regulations, as well as healthcare accreditation requirements. Elaine earned a BA from Assumption College with a double major in Psychology and Social Rehabilitation and a Master of Liberal Arts degree from Harvard University with a concentration in Psychology.


Jeffrey Gershman

Partner and Chief Executive Officer

Jeff Gershman is the Chief Executive Officer for Square Medical Group and has held this position since 2011. Jeff graduated from New York University’s Stern School of Business with a bachelor’s degree in Finance and Accounting. After working in Investment Banking and Healthcare Startups Jeff joined Square Medical Group to help the founder, Dr. Natalie Lender, build her vision for a community focused mental health/substance abuse agency. Jeff Gershman serves on the board of M.A.S.H (Massachusetts Alliance for Sober Housing).


Lana Surilov

Practice Director

Bio coming soon


Cara Garvey

Director of Patient Access

Bio coming soon


Jennifer King Alfieri

Billing Director

Bio coming soon


Dawn Drummey

Program Director, River House

Dawn Drummey is a groundbreaking professional in the field of mental health and substance use disorders. Her primary goal is to pioneer the many facets that are ongoing in the industry. She is a self-motivated and results oriented professional with more than 20 years’ experience in various fields of business development and executive leadership. She has proficiency in industries that include but not limited to healthcare governance, and organization and management guidance. Prior to working in her current career, Dawn had experience working in Public Relations for the Philadelphia 76ers, Marketing for Temple Athletics, Fundraising and Development for local non-profits to include the Battleship New Jersey. She lived in North Carolina for a few years while her husband was stationed at Ft. Bragg and during that time, she worked with a local hospital to build and operate a successful Wound Care Center where she was awarded several honors for her work. She is gifted and committed to providing exceptional service and improving outcomes for organizations and the population it serves. In her downtime, Dawn enjoys a variety of hobbies that include hiking with her husband and two dogs, reading, advocacy for mental health awareness, mentoring, listening to music, and learning new treatment modalities.


David Selden, LICSW

Clinical Director

David R. Selden, LICSW has over 40 years’ experience in the field of behavioral health. In addition to his work as a clinician, he has served as supervisor, executive level manager and consultant to local and national programs providing mental health, substance use and co-occurring disorder treatment services to teens and adults. In addition to his responsibilities at Square Medical Group, he also maintains a private clinical and consulting practice in Salem, Massachusetts and is adjunct faculty at Salem State University in the departments of Social Work and Counseling Psychology.


Joelle Flynn, LMHC

Clinical Director, River House

Bio coming soon


Medical and Clinical Team


Kenneth Adelman


Dr. Adelman is a board-certified psychiatrist with over 25 years of clinical experience working with adolescents and adults. He obtained his MD at Temple University and his residency training at UCLA in 1992 before moving on to hold faculty positions at University of Michigan, Tufts University, University of Massachusetts and Boston University. Since moving to the Boston area in 1996 he has held clinical and administrative positions in hospital and outpatient settings in both the public and private sector. His areas of interest include neuroeconomics, Darwinian medicine, cognitive neuroscience and psychiatric informatics. At Square, he seeks to leverage his diverse experience and interests to develop individualized, understandable and achievable plans of care for his patients. Dr. Adelman joined Square Medical Group in 2018 and sees patients at their Watertown location. He is certified to provide buprenorphine treatment and Transcranial Magnetic Stimulation (TMS).

Alexander Kozlovsky


Alexander Kozlovsky, M.D. earned his M.D. at St. Petersburg State Medical University in St. Petersburg, Russia in 1987. He first completed his residency training in Psychiatry at Bekhterev Psychoneurology Institute in St. Petersburg in 1990, and then at Boston University Medical Center in 2000 and is Board Certified in Adult Psychiatry by the American Board of Psychiatry & Neurology. He served as an Attending Psychiatrist, Clinical Instructor and then as an Assistant Clinical Professor at New England Medical Center. Dr. Kozlovsky worked as the Medical Director for Arbour-HRI Hospital in Brookline and later as the Medical Director for Adult In-Patient Psychiatry Service at North Shore Medical Center in Salem, Massachusetts. In 2007, Dr. Kozlovsky joyed Psychological Care Associates, a private group practice in Woburn, Massachusetts providing psychopharmacological evaluation and management for general adult population. As of May 2021, Dr. Kozlovsky has become a staff member at Square Medical Group and is offering in-person appointments in our Woburn location, as well as telehealth appointments.


Gregory Labun


Dr. Gregory Labun is an Assistant Professor of Psychiatry at Tufts University Medical School, Board Certified in Adult Psychiatry by the American Board of Psychiatry and Neurology. He completed his Residency training in psychiatry at Tufts Medical Center. Dr. Labun has special interest and expertise in Psychopharmacology and Addiction and Forensic Psychiatry. He has years of clinical experience working with patients undergoing court-ordered forensic evaluations on an inpatient basis. He has administrative and leadership experience serving as a Medical Director of an Acute Inpatient Psychiatric Unit. Dr. Labun has provided numerous forensic consultations in civil commitments and guardianship cases as an Independent Medical Examiner / Expert Witness in his private practice. Dr. Labun sees patients at Square Medical Group, in both Watertown and Weymouth, for general psychiatric and addiction issues. Dr. Labun is certified to provide Transcranial Magnetic Stimulation (TMS) treatment.


Cynthia Carter


Cynthia S. Carter, MD is Certified in the practice of Psychiatry by the American Board of Psychiatry and Neurology and has over 35 years of clinical experience.. She received a Bachelor of Science from Howard University in Washington, DC and medical degree from the University of Illinois at Chicago. She received psychiatric training at Yale University with an emphasis in Addictions and Forensic Psychiatry. She completed a Fellowship in Forensic Psychiatry at Case Western Reserve University. Her areas of interest include Addictions (she is certified in the prescription of Suboxone), the interface between Law and Psychiatry, Mood Disorders, Anxiety Disorders, Psychotic Disorders, Eating Disorders, Women’s Issues, psychopharmacology and Cross-Cultural Issues. She speaks English and Haitian Creole. Dr. Carter sees Square Medical Group patients in the Watertown office. She is certified to provide Transcranial Magnetic Stimulation (TMS).


Alan Fisch


Alan Fisch, MD has been working in the mental health field for many years as practitioner and educator. He taught trainees in psychopharmacology at Metrowest Medical Center, and Tufts Medical School; and Family Therapy at the Beth Israel Deaconess Hospital in Boston, as well as psychiatry residents. Dr. Fisch is Board Certified in Psychiatry and recently became a Diplomate in the American Board of Addiction Medicine and a Fellow in the American Society of Addiction Medicine. Additionally, Dr. Fisch has served as consultant to area clinics and practitioner in the areas of group and family therapy as well as addiction medicine. Dr. Fisch gives back to his community as former Commissioner in the Commission for the Arts, local Neighborhood Association Welcoming Committee, and local Mental Health Community Council. He gives fascinating historic tours of the Boston Public Library, Copley Square, and for relaxation he plays the baritone Saxophone in a 9-piece jazz band, Six O’clock Jump.


Nurse Practitioners

Anna Coulstring


Anna Coulstring is an ANCC board-certified Nurse Practitioner who joined Square Medical Group – Weymouth in 2011. She received her Bachelor & Master of Science in Nursing from MGH Institute of Health Professions. Her clinical interests include addiction medicine, influence of the media on health & body image and obesity/weight management. Anna has been working in primary care & addiction medicine since 2010. She currently provides medication management & therapeutic support to patients with Substance Use Disorders. She is a certified Buprenorphine prescriber and also supports patients on medications including Vivitrol & Sublocade. She wholeheartedly believes in supporting patients struggling with addiction to not be defined by this disease and gives them the resources needed to thrive in all areas of their lives. As a lifelong resident of the South Shore she is enjoying the privilege of giving back to her community through her current role at Square Medical.


Lauryn Hebert


Lauryn Hebert is a dual certified psychiatric mental health and family nurse practitioner. She received her Master of Science degree in nursing as a family nurse practitioner at Simmons University and her Post Master’s psychiatric mental health nurse practitioner graduate certificate from the University of New Hampshire. She is ANCC board certified and has been a family nurse practitioner for 9 years. Lauryn has worked in the skilled nursing facility and home health setting caring for the adult and geriatric population. During her work as a family nurse practitioner Lauryn developed a passion for caring for those with mental health disorders. This inspired her to go back for additional training in psychiatric management. Her psychiatric clinical training included interning at a community mental health center, acute care emergency services, and a private practice delivering individual and group therapy. Lauryn also received additional knowledge and training in complimentary alternative medicine working under a neuropsychologist who did a fellowship in integrative health and medicine. Lauryn believes in delivering holistic person-centered care. She has a collaborative approach with her patients working as a team to come up with solutions to improve overall quality of life. Her interests include anxiety disorders, geriatric psychiatry, and complimentary alternative medicine. She is currently offering medication management and therapeutic support through telehealth appointments. Lauryn loves to run, travel, and spend time with her goldendoodle Violet.


Tanya Gershman


Tanya Gershman is an ANCC board-certified Psychiatric Mental Health Nurse Practitioner. She received her Bachelor of Science in Health: Science, Society, and Policy from Brandeis University and her Bachelor and Master of Science in Nursing from the University of Pennsylvania. Her interests include addiction medicine and co-occurring disorders. With an integrative mindset, she focuses on the blend of medication management and therapeutic support. Before nursing school, Tanya worked with patients suffering from treatment resistant depression in the Transcranial Magnetic Stimulation department of Square Medical Group. Her clinical experience in Philadelphia included inpatient, IOP, and community clinic care. She participated as a moderator for the Penn Nursing Psychedelic Revival Learning Series, bringing awareness back to these forgotten treatment modalities. Tanya is offering in-person Suboxone clinic and medication management appointments in our Watertown and Woburn locations, as well as telehealth appointments.


Jay Hedrington


Jamaal “Jay” Hedrington MSN, PMHNP-BC, is a board certified Psychiatric Mental Health Nurse Practitioner, with training and experience caring for patients with psychiatric disorders. He has years of experience helping individuals with mental health challenges manage their complex emotional needs. Jay earned his Master of Science in Nursing, Psychiatric Nurse Practitioner specialization, from Regis College in Weston, MA. He strives to provide compassionate client centered care to every person he treats. Jay's practice philosophy is forging relationships with people to understand their health needs and goals and working collaboratively with each individual to develop a plan to achieve their best possible state of mental and physical health. His best advice for individuals seeking help to manage their mental health challenges is this: Though it is impossible to erase our past we can through small consistent efforts create a brand-new ending for our story. Jay is offering in-person appointments in our Woburn location, as well as telehealth appointments.


Marlyn Jules


Marlyn Jules has been a Family Nurse Practitioner for over twenty-one years. She joined Square Medical Group in October of 2011 and practices in the Weymouth office, delivering care with compassion and bringing hope to patients with ‘substance use disorders.’
She acquired her master’s degree from Northeastern University and received her clinical training at Beth Israel, Children’s Hospital and numerous clinics in the Boston area. Marlyn has received the “Clinical Excellence Award in Nursing” from the Massachusetts Nurses Association. She has worked as an adjunct faculty member for nursing at the Roxbury Community College, teaching clinical and laboratory components for over twenty-one years. She is an avid gardener and brisk walker. Marlyn has served in the roles of nursing supervisor, manager, educator, mentor and Quality Assurance professional. She enjoyed being the featured speaker at nursing graduations in the US and as a nursing workshop facilitator in the Caribbean.

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Kathryn Sutherland


Katie is a board certified Psychiatric Mental Health Nurse Practitioner caring for individuals with mental health needs across the lifespan. Katie received her Bachelor’s in Psychology from the University of Massachusetts Boston and her Bachelor’s in Nursing from Northeastern University. Following her Undergraduate education, Katie earned her Master’s in Nursing from Regis College. In August 2022, Katie became board certified in psychiatric mental health and became a Psychiatric Mental Health Nurse Practitioner. In this role, she has worked in various levels of care including dual-diagnosis Partial Hospitalization Programs, Intensive Outpatient and General Outpatient in addition to Detox and Clinical Stabilization Services. She has experience working across the lifespan with focused experience with adolescents and young adults. Her clinical interests include utilizing Dialectical Behavioral Therapy (DBT) skills to manage anxiety, depression, insomnia and substance use disorders.


Martin Frazee


Martin Frazee is a board-certified Psychiatric Nurse Practitioner based in the Greater Boston area. He completed his education at Northeastern University and furthered his training at Brigham Psychiatric Specialties. As a Psychiatric Nurse Practitioner at Square Medical Group in Woburn, Martin brings a wealth of knowledge and experience to the table. He is particularly interested in psychiatric research and health disparities, integrating insights from these areas into his practice. Martin is committed to providing comprehensive and compassionate care, ensuring that each patient's unique needs are addressed with the utmost attention and professionalism.



Patricia Larson


Patricia Larson LICSW is a Board Certified Licensed Independent Social Worker who has been in practice for over 30 years. She graduated from Salem State College with a BA in Psychology and an MSW from Boston College School of Social Work. She did her Internships at Tewksbury State Hospital and at McLean Hospital in the Psychotic Disorders Unit. She has worked at the Carney Hospital in Dorchester, MA doing both Inpatient and Outpatient Work. She also worked at Charles River Counseling Services in Newton, MA for many years doing Outpatient Work. Pat specializes in working with Adults around Anxiety, Depressive Disorders, and Substance Abuse. She also enjoys working with Clients in Bereavement and with Schizophrenia. She has been with Square Medical since July 2015 and works in the Watertown Office.


Pearl Morgovsky


Pearl Morgovsky is Mental Health Counselor specializing in Individual and Family Therapy. She completed her Masters at William James College with concentration in Family and Couples Therapy. She did her Internships at McLean Hospital at Waverly Place Program and at Square Medical. Ms. Morgovsky works in EFT (Emotional Focus Therapy) modality, Solution Focus Therapy and DBT. Ms. Morgovsky has years of experience working with older adults and families dealing with illnesses related to dementia, memory loss, and depression. She also enjoys working with couples, going through difficulties in their marriage.


IOP/PHP Clinicians

Kayla Guirguis

PHP/IOP Coordinator Therapist

Kayla received her MSW degree at Boston University in August 2022. She completed her BU internship at SMG in the IOP and Outpatient department and joined the staff here in September of 2022. Her previous experiences include a role as a Victim Advocate at the Washington County District Attorney’s Office in Portland, Oregon and work with children, the homeless and people with substance use disorders. Her professional interests include children, youth and substance use disorders. She is currently the Lead Clinician for our Evening IOP and provides individual therapy.


Sarah Katz

IOP Coordinator

Sarah is a Board-Certified Music Therapist with close to 20 years in the Mental Health field. As a Music Therapist, she has provided group and individual counseling and Music Therapy services to children, adults in inpatient hospitals, adults with dementia, neuro-divergent pre-teens, those experiencing homelessness and individuals in outpatient treatment. Sarah completed her MS in Counseling from Salem State University in May 2022, completing her internship here at Square. Since May she has served in our Outpatient Services as Lead Clinician for our Day IOP and as a therapist for individual clients.


Kelsey Vasquez


Kelsey is an experienced clinician with more than ten years working within the Mental Health and Substance Use related industry. Kelsey is currently the Clinical Supervisor for Square Medical Group - River House Men's COE residential program working as the Master’s Level Clinician. Utilizing her experience, she has a history of working in a variety of levels of care, implementing multiple treatment modalities and interventions. Kelsey obtained her Master's in Education, from Cambridge College out of Boston, MA. She currently holds her LADC-1 licensure and is actively pursuing the LMHC licensure; expecting to obtain it in 2023. She is the Tobacco, HIV/HCV, and PAC coordinator mandated through BSAS for the COE Residential program. In her downtime, she loves to travel with her family and friends. To give back to the community, she provides in-home HIV test kits and HIV/AIDs education to underserved marginalized populations. She loves to play sports (Lacrosse, Softball) and spend time outdoors

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