Johnny Celestin – Executive Director

Johnny Celestin is the Executive Director of MONS. With over 30 years of experience in the private, public, philanthropic, and nonprofit sectors, he brings extensive leadership and expertise in international development, governance, community development, and nonprofit management.

Johnny has contributed to numerous prestigious organizations and institutions, including Accenture LLP, The Atlantic Philanthropies, The Clinton Foundation, The Future Leaders Foundation, The Haitian Center for Leadership and Excellence, The Haitian Fund for Innovation at Rockefeller Philanthropy Advisors, and The Robin Hood Foundation.

An entrepreneur and advocate for social change, Johnny is a dedicated bridge-builder and serves on the boards of multiple nonprofit organizations in both Haiti and the U.S. In all his roles, Johnny leverages his deep knowledge in international development, public service, and nonprofit leadership to champion human rights and equity.

Miguel Bonilla - Deputy Director of Capacity Building

With over 30 years of experience in social justice, capacity building, and nonprofit management, Miguel is a seasoned professional. His expertise includes organizational development, leadership, strategic thinking, and fiscal management. Miguel is passionate about supporting BIPOC-led nonprofits and has a proven track record in implementing capacity-building initiatives. Prior roles include Senior Director for Capacity Building at the Department of Youth and Community Development and Director of Strengthening NYC Nonprofits at United Way of NY. Miguel holds master's degrees in Organization Development and another in Urban Policy.

Diane Mamet - Deputy Director of Contracting

Diane is excited to serve as the inaugural Deputy Director of Contracting at MONS. Having worked for Human Service Agencies at the City of New York for over a decade, Diane’s work and commitment to the nonprofit sector started long before joining this office. While at the Department of Homeless Services, she led the efforts for the implementation of the rate rationalization and model budgets process, as well as successfully negotiated over 400+ site budgets. Her efforts as the Project Manager at DHS for the Clear the Backlog Initiative resulted in the release of $2.2 billion dollars in aged contracts back to the sector. Diane’s work is grounded in making NYC an equitable business partner with the Nonprofits NYC contracts with.

Sade Oyebode - Project Coordinator

Sade brings over nine years of experience in project coordination and administrative management. Formerly the Office Manager and Administrative Trainer at VNS Health, Sade led the development, collection, and interpretation of data for quality training outcomes. She holds a Bachelor of Science in Business Administration and is dedicated to optimizing operations and driving positive change at MONS.

Josefa Silva - Senior Policy Advisor

With over 15 years in the nonprofit sector, Josefa Silva is serving as Senior Policy Advisor at MONS. Her work focuses on advancing solutions for the challenges facing low-income New Yorkers. Josefa has shaped impactful legislation, built coalitions, authored research and policy reports, and led program evaluations.