About Us

What We Do

Mainstay provides human service and housing programs across Massachusetts, including permanent supportive housing and compassionate, person-centered home care. Our programs have helped hundreds of people live productive and stable lives in their own communities every day for all of these years.

Our History

Mainstay was founded in 1975 under the name Mental Health Programs, Inc. (later MHPI, Inc.)- to provide affordable, community-based housing to people with mental illness. In 1999, a service affiliate, Residential Support Services Inc. (RSSI), was founded to provide care and services to our residents and others in the community. Our mandate has since expanded to cover a variety of vulnerable populations, including low-income elders; people with intellectual, developmental, and physical disabilities; and the recently homeless. In 2019, the companies were merged under the name Mainstay to reflect our integrated programs and approach to care.


  • Larry Oaks

    President & CEO


  • Doreen Cummings

    Doreen Cummings

    Director of In-Home Services


Larry Oaks

With twenty two years of non-profit and for profit leadership experience, Larry became the second President and CEO of MHPI in January, 2018. Most recently he was a Managing Director at the Corporation for Supportive Housing, a national non-profit that advances housing based solutions to help vulnerable people lead productive lives. Prior to CSH he served as Vice President of Housing at the Local Initiatives Support Corporation (LISC) in New York City, a community development financial institution with thirty one offices nationwide. Earlier in his professional life he was as a Senior Project Manager at Peabody Properties, Inc., an award winning developer of multi-family and supportive housing headquartered in Braintree, MA. For the first twelve years of his career he held a number of positions at the New York City based non-profit organization Housing and Services, Inc., including four years as Executive Director.

Doreen Cummings

Doreen is a graduate of Wheaton College and earned her B.A. in Psychology. She is enrolled at the Brandeis University Heller Graduate School.

For the past 25 years, Doreen has dedicated her professional career to enhancing the lives of children, teens, adults and Senior Citizens with disabilities and their families, by creating day, housing and family support programming and resources to meet the needs of this population.  She was a member of the leadership teams at both the Charles River Center (from 1994-2004), and at JF&CS (from 2005-2017).  

A particularly important project in Doreen’s career was being on the creative team which opened the supportive housing programs, serving 70 adults in unique shared group living settings.  This program allows adults to live in more integrated homes in the community, and to move our of their family home.

Doreen was appointed by Governor Baker to be a member of the Governor’s Commission on Intellectual Disabilities in the Commonwealth. The Commission is an independent citizen oversight body appointed by the Governor to public policy in the area of intellectual disability in the state.

Doreen has two amazing children, Nina and Nate.  She has a particular interest in raising awareness about Cystic Fibrosis and fighting for the cure, as Nina has this genetic disorder.

Doreen enjoys playing softball, singing, being a fan of all Boston sport’s teams, mystery shopping and coaching girl’s softball. 

Board of Directors

Jeanne M McHallam
Joyce Gair
Robert S. Manasse
Clifford Robinson
Newt H. Levee
Alice Rose

Mainstay Team

Christopher Andrews

Finance Manager

Heather Bacon

Registered Nurse

Susan Horner

Director of Housing Services

Constantinos Magimbi

Service Coordinator

Avanelle Martin

Human Resources Manager

Tomas Neruda

Assistant Property Manager

Ronald Quimby

Assistant Property Manager

Kathryn Soderholm

Assistant To Administrator

Jamal Ward

Sr. Residence Manager

Our Locations

We manage supportive housing in these Massachusetts residential areas. Search for a specific town or click on our locations to learn more about them and the area!

*Looking for affordable housing or Homecare services?
Contact Us to see how we can help!

Mainstay Supportive Housing & Home Care - Locations Map