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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.

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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 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).

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Chief Operating Officer

Brad Greenstein is a partner and serves as the Chief Operating Officer of Square Medical Group. In his capacity as COO, he oversees TMS, PHP/IOP, and Residential operations along with business development and merger and acquisition opportunities.

Mr. Greenstein has over 20 years of experience in the behavioral health industry with a focus on leadership, operations, reimbursement strategies, and business development. He has extensive experience with startup organizations, and multi-state systems, as well as program development and new business line expansions.

Mr. Greenstein previously served as the New England Regional Director & CEO of the Boston Center for Addiction Treatment for Recovery Centers of America, Inc. (RCA). He was a part of the original management team tasked with creating the overall business plan for RCA and securing over $300M in private equity funding through Deerfield Management in New York, NY.

Prior to RCA, he served as Senior Vice President of Business Development for Spectrum Health Systems, a comprehensive behavioral healthcare system with operations in multiple states and revenue in excess of $60M.

Mr. Greenstein has also served as the Co-Founder and Chief Executive Officer of Las Vegas Recovery Center and was involved with the initial startup team which developed the nationally recognized substance abuse treatment agency.

Mr. Greenstein has served on the board of a number of community and national non-profit agencies including Foundation for Recovery, Inc. and PACT Coalition for Safe and Drug-Free Communities. He was also appointed by the State of Nevada Governor Brian Sandoval to serve on the State of Nevada Mental Health Planning and Advisory Council along with the State of Nevada Substance Abuse Prevention and Treatment Advisory Board. He also previously served on the National Advisory Board of SelfRefind, a growing multistate office-based opioid treatment (OBOT) provider.

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Vice President of Operations

Elaine Stark, Vice President of Operations, 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.

Director of Programs

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.

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Director of TMS

Giovanni “Gio” Marinelli, Director of TMS (Transcranial Magnetic Stimulation), joined Square Medical Group in the beginning of 2019. Giovanni earned a BA in Psychology at UMass Boston and continued his education there to earn his MBA in Healthcare Administration & Entrepreneurship. After completing an internship for the MA Committee on Healthcare Financing while pursuing his MBA, Gio realized his appreciation for the healthcare industry and its potential for innovation. In his role as Director of TMS, Gio continues his interest in healthcare innovation by focusing on facilitating and growing the operations of the TMS division efficiently in order to help make this innovative treatment for depression available to those who need it.

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Billing Manager

Robin Pape, Billing Manager. Robin joined Square Medical Group in January 2014. She brings many years of medical billing experience to Square. Robin has worked for small and large mental health practices in the South Shore area. As a result of these experiences, she brings with her the knowledge of a variety of medical software programs.

Robin is able to keep up with the ever-changing landscape of medical billing by taking part in webinars and meetings hosted by insurance companies. This knowledge helps her to work through billing challenges and support our patients from a business perspective.

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Call Center Supervisor

Leticia Leao is the Call Center Supervisor for Square Medical Group. In this capacity she has the opportunity to utilize her organization and communication skills to assist patients through the insurance, booking and scheduling process and provide them with answers to a variety of administrative questions while offering support to other Call Center Representatives.

Prior to working for Square, Leticia served in a number of customer support roles. She also brings several years of experience working with special needs youth in a classroom setting. She has been working for Square Medical Group since 2017.