Sandra CotterellSandra Cotterell
Chief Executive Officer

Executive Assistant: Lisa Hamblin
(617) 822-8329 

Sandra joined Codman Square Health Center in 1994 as Chief Operating Officer. In 2011, the Board of Directors appointed her as Chief Executive Officer of the Health Center.

She began her career in health care as a nurse working for Mass General Hospital and New England Medical Center. In 1985 she transitioned into an administrative role in the health insurance industry. She worked at Baystate Health where she held several positions, and completed her time there as the Vice President of Clinical Services.

In June 2007, the Massachusetts League of Community Health Center honored Sandra with an Outstanding Employee Award. She also holds a Bachelor of Science in Nursing from Simmons College. She currently serves on the Boston Medical Center Board of Directors, Massachusetts League of Community Health Center Board of Directors, Healthworks Community Fitness Board of Directors, Daily Table Community Advisory Board, Greater Four Corners Action Coalition Board of Directors, Neighborhood Health Plan Advisory Committee, BMC HealthNet Board, the Codman Academy Charter School Board of Directors, and is the President of the Boston Accountable Care Organization Board of Directors. Ms. Cotterell also serves as a Contributing Faculty member at the Kraft Center for Community Health and is a guest lecturer at Harvard T.H. Chan School of Public Health and Brandeis University Heller School for Social Policy and Management.

In 2013, Sandra was recognized as an Excellence in Leadership Finalist by the Massachusetts Nonprofit Network. Every year since 2014, Sandra has been recognized as one of the Top 100 Women Leaders in Business in Massachusetts by The Commonwealth Institute.

Ms. Cotterell has been involved in nearly every aspect of running Codman. She has continued building on the vision of a foundation of preventive and primary care services that engages consumers and embraces innovation — while never losing sight of our mission to provide access to care. Under Ms. Cotterell’s leadership, Codman underwent a 32,000 sq. ft. Gold LEED certified expansion and transformed our 450 Washington Street location into the Wellness and Fitness Center complete with our partner fitness center, Healthworks Community Fitness, our partner non-profit grocery store, Daily Table, and our new community Teaching Kitchen.

Ms. Cotterell lives in Mission Hill with her husband and three children. Together with her husband, Ian, the Cotterell’s run a Pop Warner football and cheerleading program serving youth in the Boston and Brookline community.

Yi Jung
Chief Financial Officer
(617) 822-8711

Yi Jung is a seasoned financial manager with extensive administrative and operational skills, strong business acumen and the ability to collaborate al all organizational levels. Her expertise includes strategic planning, accounting control and guidance, budgeting, forecasting and process improvement. She has significant experience with a variety of health care reimbursement systems and regulatory compliance. Yi joined the Codman Square Health Center in 2012 as its interim CFO. Prior to working at the Health Center, Yi ran her own consulting business, focused on organizations needing assistance with such matters as systems conversions, compliance and reporting, and budgetary and financial forecasts and stability. She also served as CFO to Vinfen, a $100M human services provider in Massachusetts. She worked as Director, Fiscal Affairs at Continuum Corporation – a company that owned and operated multiple skilled nursing facilities. She has also worked at Mediplex Group, a publicly traded skilled nursing facility organization and was a senior manager at Coopers & Lybrand. Yi has a Master of Science from Harvard University – School of Public Health and a Bachelor of Science, Accounting, from Northeastern University.

Chip Severin

Chip Severin, MD
Chief Medical Officer
(617) 822-8352

Dr. Severin joined Codman Square Health Center in 1995, and has served as its Medical Director since 2004. He has been named Chief Medical Officer in February 2011. Prior to joining the Codman team, he served as a physician and Director of Public Health at Serabu Hospital in Sierra Leone. He has also worked as an Emergency Room doctor in Wisconsin and volunteered at L’Hopital Albert Schweitzez in Deschapelles, Haiti. Dr. Severin was awarded the Outstanding Massachusetts Community Health Center Physician Award by the Massachusetts League of Community Health Centers in 2013.

Anthony Stankiewicz, Esq
Chief Advancement Officer, Chief of Staff
(617) 822-8358

Tony focuses his practice on strategic, development and external relations efforts, including government and community relations, marketing, public relations, communications and governance matters. He is currently managing the Codman Square Health and Education Center capital expansion project, a $14.1M addition to the 637 Washington St. facility.   Prior to joining Codman, he served as Chief Governance Officer at the Boston Stock Exchange, where his responsibilities included external relations, communications, governance and membership. An attorney by training, Tony serves or has served on a number of non-profit and foundation boards, including the Massachusetts Bar Foundation (past-president), Boston Securities Traders Foundation, Holy Family Hospital of Methuen (Caritas), Andover Retirement Board, and the Women’s Educational and Industrial Union, among others. Tony is a graduate of Boston College (’84) and Suffolk University Law School (’87).

Photo of Tarsha Weaver

Tarsha Weaver
Chief Operations Officer

Executive Assistant: Trudy Griffin
(617) 822-8382 

Bio coming soon.




Adeola Ogungbadero
Director of Operations
(617) 822-8199


Stephen Tringale, MD
Medical Director of Performance Improvement and Research
(617) 822-8352

Dr. Tringale came to Codman Square Health Center in 1997, and serves as our Medical Director for Performance Improvement and Research and Medical Director of Family Medicine. In addition to his clinical degrees, Dr. Tringale also has a Master's degree in Biochemistry (Boston University, 1986) and is a Fellow of the American Academy of Family Practice. After his residency he was a Commissioned Officer with the US Public Health Service and worked on the Hopi Reservation with the Indian Health Service in Arizona. His interests are in Women’s Health, and teaching Family Medicine Residents and medical students.




Robert J. MacEachern – President

Robert J. MacEachern

Robert is a third generation Codman Square resident, has been on the Board since 2003. Robert first became active in the Codman Square community while in middle school and his commitment to Dorchester hasn’t stopped. He was a member of the Mellen Street Crime watch, resurrected the long dormant Ashmont Hill Civic Association and was elected its President during his junior year of high school.


Robert is a proud graduate of the Boston Public Schools with a learning disability. He has BA in Black Studies and Urban Studies from UMass/Boston. He has spent the past 15 years working with “at risk teens”. First with the UMass Boston Upward Bound TRIo Program, and most recently as the Senior counselor at the Home for Little Wanders Waltham House, which is a group home for LGBTQ youth.


Robert counts one of the biggest blessings of his life, has been growing up and living in such a great and dynamic community.


Ardis Vaughan

A Dorchester resident, Ardis has served on the board of CSHC since 1998. She is a Principal of Shawmut Environmental, LLC, an environment, health and safety consulting company. Ardis holds B.A. and B.S. degrees from Rutgers University. She also serves on the Executive Boards of the New England Sections of NAEM and A&WMA professional associations.


In her own words: “CSHC is an integral part of my neighborhood. CSHC provides medical, civic, social and educational services that improve lives for so many of our residents, patients and students.”

Thabiti Brown

Thabiti Brown

Thabiti has served on the CSHC Board since 2005. In his day job, he is the Head of School of Codman Academy Charter Public School where he has worked since the school’s inception in 2001. He holds a BA in Urban Studies / American Civilizations from Brown University and a MA in Social Studies from Columbia University Teachers College. He has taught at the Beacon School in New York and at the International School of Panama, and is a recipient of the 2005 Educator Award from the Milken Family Foundation. Thabiti also serves on the Boards of the Civic Education Project (2004-present) and the Cambridgeport Children’s Center (2009-present). His hobbies include reading, writing, ‘rithmetic, basketball, and travel.


In his own words: “I believe in CSHC’s definition of health as grounded in medicine, but also inclusive of much more. At Codman Square, signs of health include meaningful relationships between community members/organizations, access to quality education, and the development of new programming to meet the needs of members of the community. I am a fan of and staunch advocate for the dedicated staff who makes the mission live and breathe on a daily basis.”


Rev. Garvin Warden

Rev. Garvin Warden
Past President

Rev. Warden joined the Codman Square Health Center board in December 2010. He is the immediate retired pastor of the Greenwood Memorial United Methodist Church in Dorchester.  Reverend Warden was born in Barbados, West Indies, spending much of his youth and young adult life there. Rev. Warden migrated to the United States in 1984, becoming a citizen in 1995. He earned a Master’s of Divinity degree from The School of Theology at Boston University, and continued his schooling by participating in a post master’s certificate program in Urban Ministry at the Urban Theology Institute in England.


He has served as Pastor at several other churches before coming to Dorchester. He also serves on the Board of Directors of the Four Corners Action Coalition, United Methodist Federal Credit Union, and the Greenwood Shalom Community Outreach. The Reverend enjoys cooking, reading, music and dancing.


His favorite part about Codman Square Health Center: “The willingness to serve those living on the margin”.



Katherine Bowes

Kathy has been a member of the CSHC Board since 2016. She is a financial expert and serves on our Finance Committee, offering guidance on our investment approach and policies. She serves as a registered representative and financial advisor in the Boston area and holds a number of securities licenses. A graduate of UMass Amherst, Kathy has always given back to her community and those in need. At Codman, Kathy has volunteered for a number of our community activities including our annual Men of Boston event for women’s health and our children’s holiday gift giveaway.



Julia Charley

A Dorchester resident, Julia has served on the board since 1995. She is an administrator for Affiliated Computer Services, Inc.

Isaac Colbert

Isaac Colbert

Isaac “Ike” Colbert is a former dean of MIT for Graduate Students. He served in different capacities at MIT from 1977 until his retirement in 2007. Since retiring Ike has been involved in a number of start-up businesses and has served on a number of local, non-profit boards like Codman. At Codman Ike has helped identify potential, new Board members and has served on our Nominating Committee.



Egobudike (“Ego”) E. Ezedi, Jr.

A Dorchester resident, Ego Ezedi has served on the board since 2003. He is Nigerian-American, born and raised in Boston, Massachusetts. His experiences as a spiritual, political and business leader have given him a unique sphere of influence throughout the Greater Boston area. Egobudike formerly worked with U.S. Congressman Michael E. Capuano of the Eighth District in Massachusetts managing the Boston (main) office. Egobudike has been a candidate for political office, a host of the Health Matters radio broadcast, and Executive Director of the Roxbury YMCA.


After experiencing the traumatic loss of his mother’s death 2005 to domestic violence, Egobudike has become an even stronger advocate for victims of domestic violence leading him to make it one of his life’s missions to stand against the evil of senseless violence everywhere. Currently, Egobudike is serving as the Sr. Pastor of Empowerment Christian Church, a ministry located in Dorchester. Egobudike is enrolled at Gordon-Conwell Theological Seminary as a degree candidate in the Masters of Divinity program and shares dual concentrations from Brandeis University and UMass Boston in sociology and psychology. Egobudike has been happily married to Melissa A. Ezedi for over 14 years and they have one beautiful daughter, Trinity Ekene Ezedi.


With all that said, Egobudike simply wants to be known as a man after God’s own heart.


Emmett Schmarsow

Emmett Schmarsow

A resident of Milton, Emmett has served on the board since 1987. He has worked for over three decades as the Program Manager for Councils on Aging and Senior Centers for the Massachusetts Executive Office of Elder Affairs. There, he oversees state grants to 349 municipalities to provide support for elders (60+) to remain independent and at-home for as long as possible. Funding is used for a wide variety of direct and indirect support ranging from outreach, transportation and health screening to fitness and education classes, support groups, newsletters and volunteerism.


Emmett is a recipient of the Manuel Carballo Award for Excellence in Public Service, the state’s highest honor for public employees. His other board affiliations include: Milton Fuller Village, ODWIN Learning Center, elected (Milton) town meeting member, MA Architectural Access Board (former) and MBTA Advisory Committee for Elders and Persons with Disabilities. Emmett has a BS from UMass, Amherst and a M.S. from RPI. In a semester away from college, he trekked solo in bicycle tour around seven European countries. He is a self-proclaimed ‘veggi-vore’ (mostly), and his hobbies include competitive race-walking, amateur photography and volunteering.


In his own words: “I love the audacity of what we are trying to do … and contributing to seeing it get done!”


Marva Serotkin

Marva Serotkin

Marva has been on the board of CSHC since 1983. She is the President and Chief Executive Officer of The Boston Home, where she has worked for eleven years. Marva is the President of the Massachusetts Extended Care Federation and past President of the Massachusetts Public Health Association. She was recently named President of the Massachusetts Long Term Care Foundation. Additionally, she is an Assistant Clinical Professor at Tufts University and a lecturer for the Boston University School of Management, as well as a member of the Newton Health Commission. She holds a B.A. from Boston University and an M.P.H. from Yale University. Marva enjoys playing tennis.


In her own words: “CSHC is an extraordinary organization. Since I have been on the Board for so many years, I have witnessed the expansion of the scope of services that encompasses so many aspects of enhancing quality of life for all those who in the Codman Square area. CSHC is a model for integrating health care with the life of the community. The staff is dedicated, innovative and committed.”


Charles O’Hara

Charles O’Hara

Charles has been a long-time resident of the Ashmont Hill neighborhood of Dorchester from 1935 to the present. He is a founding board member of CSHC and has served since 1976. He is a past President of the Board, and Board representative to the Performance Improvement Committee. Charlie is a former teacher and he and his wife Seater were previously involved in Dorchester real estate. He holds a B.S. and a M.Ed. from Boston University and completed graduate studies at the Boston Teacher’s College. Charlie’s favorite food is pizza, and he enjoys camping, biking, swimming and hiking.


In his own words: “My favorite parts of Codman Square, Dorchester are the Great Hall, the White Church, and the High School.”


Sandra Warren

Sandra Warren

Sandra is a retired Director of Human Resources at Codman Square Health Center where she served for 7 years. She also worked as Director of HR for Trustees of Health & Hospitals/ City of Boston Department of Health & Hospitals. During that time, she worked on the closing of Boston City Hospital and facilitated its merger with University Hospital, which created Boston Medical Center. Sandra volunteers at the Brookview House, Dorchester, Mass. She holds a BA from UMASS - Boston, and her hobbies include traveling, solving puzzles,

and playing piano.


In her own words: “My favorite part of Codman Square Health Center is its caring, professional and competent staff.”


Stephen Weymouth

Stephen Weymouth, Esq.

A Dorchester resident, Stephen has served on the board since 1992. He is a criminal defense attorney who has been practicing law in Massachusetts for over 25 years. Stephen also has a real commitment to the youth of Dorchester, shown through his role as the Executive Director of Dorchester Youth Soccer for many years. He holds a BA from Miami University and a JD from Suffolk University School of Law. Steve was named a Massachusetts Attorney of the Year in 2017 by Massachusetts Lawyers Weekly.




Mona Scantlebury

Mona is a resident of Dorchester. She was a founding board member of Codman Square Health Center and has served on the board since 1976. She is a long-time community activist, with a 50-year history of service to the community. Currently, she is active in social service activities through the Union United Method Church.


Bill Walczak

William J. Walczak
Founder & Former CEO

Bill is most associated with the re-development of the Codman Square area of Boston, a multi-cultural community which foundered in the 1970s and became an area known for racial unrest and economic disintegration. Bill was founder and CEO of the Codman Square Health Center, a major factor in the regeneration of the community. Bill is founding president of Codman Academy Charter School. The health center’s innovative efforts have made it nationally and internationally known. Bill has worked on community regeneration efforts in a number of countries around the world. Currently, Bill is CEO of the South End Community Health Center in Boston.

Bill is founding president of the Massachusetts Nonprofit Network, and is on the Executive Advisory Council for WBUR Public Radio. He is chairperson of the Board of Trustees of Bunker Hill Community College. He is a past President of the UMass/Boston Alumni Association and is on its Board of Visitors. He is a founder of the Edward Kennedy Health Careers Academy and is founding president of Boston HealthNet. He is president of the Massachusetts Business Alliance for Education and serves on the board of the Rappaport Center at Boston College. Bill served on both Governors Deval Patrick’s and Charlie Baker’s Health Care Transition Committees and is a Barr Fellow. He has received numerous awards for his work and ideas.