Bob Fowler, LCSW, CCS

Executive Director
(207) 775-4790 ext. 114

Bob was hired as Milestone’s Executive Director in April of 2014. He has over 25 years of experience in behavioral health treatment and administration. Bob earned his MSW degree from the University at Albany. He earned a Master’s Degree in Public Policy and Administration with a concentration in Financial Management from the Muskie School at the University of Southern Maine, and a Bachelor’s Degree from the University of Vermont. Bob’s professional experience includes various clinical positions, directing a mobile crisis team, and leading a number of nonprofit behavioral health programs throughout the northeast. He served on the Treatment Task Force of the Maine Opiate Collaborative, and was appointed to the Maine legislature’s Task Force to Address the Opiate Crisis in the State. Bob believes that Milestone serves a critical need in the community by providing compassionate, competent care to individuals experiencing homelessness and addiction, and he feels honored to work with Milestone’s staff and clients.  

Marianne Sensale-Guerin

Director of Finance and Administration
(207) 775-4790 ext. 128

Marianne has worked as Milestone’s as Director of Finance and Administration since 2014. Marianne has 30 years of experience as a financial and human resources professional. She was previously Assistant Vice President of Finance and Administration at Synergent and owner of Guerin Associates, LLC and Guerin Oil, LLC.  In 2005, she was recognized by the Small Business Administration as the state and national recipient of the Small Business Person of the Year award. She has also served as a member of the National Women’s Business Council in Washington, D.C. and was a member of the board of directors for the Children’s Dream Factory and the Jack McPhillips memorial fund. Marianne believes strongly that everyone deserves a chance at happiness regardless of the perils they my face throughout life.


Sam Heck

Director of Development
(207) 775-4790 ext. 127

Sam joined Milestone in 2017 as Director of Development. In this role, he oversees Milestone’s fundraising activities, cultivating relationships with individual supporters as well as businesses and foundations. He also supports Milestone's communications and public relations efforts. A Maine native, Sam holds a BA in English from Colby College, and has more than ten years of experience in development, having helped build support at a number of human service, environmental, and arts non-profits in Greater Portland. Sam deeply values the breadth of Milestone's services, offering support to clients at all stages of recovery.


Meghan Fischer

Nurse Manager
(207) 775-4790 ext. 115

Meg has been working as a Registered Nurse at Milestone since 2016, and was named Nurse Manager in 2019.  She graduated from Northeastern University with a degree in Anthropology in 2005 and from the University of Southern Maine with a degree in Nursing in 2009.  She went on to obtain a Master’s degree in Public Health in 2018.  Her professional experience as an RN includes working in the areas of  substance abuse, public health, and infectious disease.  Meg has a passion for working with individuals who suffer from substance use disorder and is thrilled to be involved in the work that Milestone does in the community.

Dr. Mary Dowd, MD

Medical Director
(207) 775-4790 ext. 118

Dr. Mary Dowd was a family doctor in Yarmouth, Maine, until she started working in primary care for prisoners at the Cumberland County Jail, where the majority of the inmates suffered from substance use disorders. Motivated to help others, Dr. Dowd left her family practice, and in 2008 became the Medical Director of the Detoxification Program at Milestone. Dr. Dowd also works for Catholic Charities in its substance use treatment program and at Discovery House in South Portland, a methadone clinic. Beyond treating clients who are going through withdrawal, Dr. Dowd believes in listening to people’s stories, and helping them connect with treatment and develop strategies to improve their lives. Dr. Dowd is also a published poet who has penned several op-eds for the Portland Press Herald

Tom Natalie

Shelter Manager
(207) 775-4790 ext. 123

Tom began working at Milestone in 2007 as a shelter attendant. He later became a shift leader, an assistant shelter manager, and in 2010 was appointed Shelter Manager. In this capacity, Tom manages the day to day operations of the shelter, supervises shelter staff, and oversees communications and reporting with state funding agencies. Tom also worked as a shelter attendant with the City of Portland and as an accountant for 16 years. He holds a degree in Business Administration from Husson College. He believes Milestone fills a much a needed community service, and he is committed to the organization’s staff and clients.

Joseph McNally

Director of Community Outreach
(207) 775-4790 ext. 126

Joe joined Milestone in 2008 as a shelter attendant. Before being promoted to HOME Team Manager in 2012, he served in other roles within the organization, including counselor aid, shift supervisor, and assistant shelter manager. Currently, Joe’s responsibilities include supervising the HOME Team, as well as managing some of the shelter personnel. He also actively represents Milestone within the community by working with other key agencies, including the University of New England, Mercy Hospital, Portland Recovery Community Center, the City of Portland, Preble Street, and Oxford Street. Joe is committed to Milestone’s mission and the high-quality services it provides.

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Peter Preble

Clinical Team Lead, Portland
(207) 775-4790, ext. 113

Peter has been counseling for substance use disorder for almost 20 years. He has worked in Milestone’s emergency shelter, residential program, and detox. Peter was born and raised in Maine, and graduated from the University of Maine at Orono. He received his advanced degree from Starr King School for Religious Leadership. He completed a certificate program in Alcohol and Drug Abuse Studies at the University of California, Berkeley. Most of his counseling experience has been working with people in Medication Assisted Treatment. Peter lives in South Portland and has a thirteen-year-old son who is the light of his life.

Jayme Villanueva, LADC

Operations Manager
(207) 934-5231 ext. 212

Jayme joined Milestone in 2014. As Operations Manager of the Extended Care Program, she oversees all the administrative functions of the Old Orchard Beach campus – from billing, to budgets, to helping clients access MaineCare, to daily programmatic operations – and she ensures smooth communication with Milestone’s Portland facilities. Jayme is also a substance abuse counselor and assists other clinicians with case management. Prior to coming to Milestone, Jayme was a mental health case worker for 10 years with Opportunity Alliance. She credits Milestone for placing clients on the road to recovery, and for providing effective treatment for clients who may not have had success in other programs. She holds a Bachelor of Social Work from the University of Southern Maine.