Our Team
The team at Allied Community Services offers expertise in human services, education, organizational leadership, and community living.
Leaders Advancing Our Mission
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Leigh Gallivan MahoneyPresident and CEO at Allied Community Services, Leigh Gallivan Mahoney brings decades of leadership experience in education and human services to Allied Community Services. Her commitment to serving individuals with disabilities began as a teacher serving justice-involved youth with complex developmental needs in a secure setting in Massachusetts. This unique experience shaped the principle that guides her work: The individuals we serve already have what they need; our job is to simply remove the obstacles in their way. Throughout her career, Leigh has led program development across educational, residential, and community-based settings. She has extensive experience in organizational strategy, staff development, and creating systems that center the people she serves. Leigh is a licensed teacher and special education administrator, with a bachelor’s degree from Westfield State University and an M.Ed. from American International College. Leigh credits the individuals she has served as her most impactful teachers. |
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Liz ColantoniLiz Colantoni is the Vice President of Human Resources at Allied Community Services, where she leads the strategic and day-to-day HR operations. She joined the organization in 2021 as Human Resources Director and was promoted in 2023. Liz earned her bachelor’s degree in human resources management from Bay Path University and is currently pursuing her graduate degree. Her career has been rooted in mission-driven work across senior living, healthcare, and human services, making Allied’s mission a strong fit with her values and approach to HR. Her areas of expertise include talent acquisition and retention, performance management, employee engagement, compensation and benefits, compliance and risk management, and organizational development. Liz is committed to supporting Allied’s mission by aligning HR goals with the organization’s culture and the needs of the people it serves. |
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Marc MauricioAs Chief Operating Officer, Marc Mauricio oversees daily operations at Allied Community Services. He brings over 25 years of experience in human services for children and adults, beginning his career working with youth in residential and school settings, before transitioning to disability services. Marc has led 24-hour residential programs, vocational services, day programs, and transitional services for youth and adults across organizations of varying sizes in Massachusetts, Rhode Island, Connecticut, and California. He holds bachelor’s degrees in criminal justice and philosophy, as well as a master’s degree in contextual and cross-cultural theology from Vrije Universiteit in the Netherlands. Marc is a committed advocate for equality and civil liberties and has dedicated his professional career to serving others. |
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Beth SuleskiAs Chief Compliance Officer, Beth Suleski ensures that all programs meet the highest standards and comply with the Connecticut Department of Developmental Services’s requirements. She brings over 12 years of quality assurance experience and continues advancing her expertise through ongoing training and education. Beth holds both bachelor’s and master’s degrees in human service management with a concentration in organizational leadership, and is certified in mental health first aid, equipping her to lead with excellence and integrity. Beyond her compliance work, she actively advocates for legislative initiatives that protect the rights and freedoms of individuals with disabilities, ensuring they’re connected with quality services and opportunities. |
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Marlene ThomasMarlene Thomas joined Allied Community Services in 2025 as Controller, bringing over 22 years of nonprofit finance experience. Her career includes leadership roles at nonprofit organizations, operating her own accounting practice, and working with CPA firms. At Allied, Marlene oversees accounting, contracts, and compliance with state and federal requirements. Her expertise spans accounting, government contracts, IT, cybersecurity, internal audit, facilities management, and regulatory compliance. She is leading the organization’s fiscal transformation to ensure long-term sustainability and operational excellence—strengthening systems so resources are maximized for the individuals Allied serves. Marlene holds a bachelor’s degree in business administration and accounting from Bay Path University and is a graduate of the Hartford Leadership Development Roundtable program. Marlene currently serves as finance chair on the board of directors for Mental Health Connecticut. |
| To contact our team, email us at info@alliedgroup.org. | Email the Allied Team |