Ronnie L. Bloom, Esq. 
Executive Director

Ronnie has used her extensive leadership experience and expertise in philanthropy and public policy to address the needs of our community's most vulnerable children.  Before joining the Stoneleigh Foundation, she was a partner in Opportunities Exchange, which helps policymakers and providers improve the quality of early care and education for disadvantaged children, and the Program Director of Children, Youth and Families grantmaking at the William Penn Foundation where she directed the Foundation's efforts in public education, youth development and early education.  Ronnie began her career as an attorney, and received both her BA and law degrees from the University of Pennsylvania.

Anne Marie Bonner, MS
Communications Manager

Anne Marie joined Stoneleigh’s staff in 2017 and manages the Foundation’s strategic communications activities, including online and social media engagement, media relations, publications, and events. She brings experience in research and policy communications, having most recently served as manager of communications and events at the Economy League of Greater Philadelphia. Previously, she worked at the Penn Wharton Public Policy Initiative and the international humanitarian agency Catholic Relief Services. Anne Marie holds an MS in Social Policy from the University of Pennsylvania, a Certificate in Law from Penn Law, and a BA from Villanova University.


Mark J. Houck, BS
Communications & Program Associate

Mark joined Stoneleigh's staff in 2016.  Prior to Stoneleigh, Mark worked for four years as a student and project coordinator for the Juvenile Justice Research and Reform Lab at Drexel University.  There, he helped implement Dr. Naomi Goldstein's evaluation of the Philadelphia Police School Diversion Program and worked closely with the Philadelphia Police Department, the Department of Human Services, and the Department of Juvenile Probation on a number of other research projects.  Mark also spent three years in Philadelphia working with Juvenile Probation and Family Court as a child and family case manager for the Joseph J. Peters Institute.  He earned his BS in Psychology from Drexel University.

Laura E. Johnson, MPA
Strategy & Planning Officer

Laura joined Stoneleigh's staff in 2015.  She has spent her career working at the intersection of research, policy and communications.  Prior to joining the Foundation, she served as the Director of Initiatives and Communications at the Economy League of Greater Philadelphia, as the Communications Manager at Public/Private Ventures, and as a AmeriCorps VISTA volunteer.  In these roles, she has focused on a wide range of social policy issues, including education, youth development, employment, criminal and juvenile justice, and prisoner reentry.  Laura earned her BA in Philosophy and Political Science from Boston University and her MPA, with a specialization in public policy, from the Wagner Graduate School of Public Service at New York University. 

Rona M. Navera, SHRM-CP
Director of Administration

Rona has been with Stoneleigh since 2010 and oversees administrative, human resource and office management responsibilities. Prior to Stoneleigh, she worked as fund development officer with a local non-profit organization and as administrative assistant to a Philadelphia City Council member. She serves on the Board of the Asian American Women's Coalition and is a volunteer ESL teacher at the Nationalities Service Center.  Rona has a Masters degree in Multicultural Education and is a certified human resource management professional.

Marie N. Williams, Esq.
Senior Program Officer

Marie joined the Stoneleigh Foundation in 2016 after having served as Executive Director of the Coalition for Juvenile Justice (CJJ).  During her tenure at CJJ, Marie executed the organization's strategy to support robust appropriations for the federal Juvenile Justice and Delinquency Prevention Act, and educated policymakers about optimal juvenile justice and delinquency prevention systems and practices.  She has more than fifteen years' experience as a public policy advocate, including acting as a Senior Lobbyist for NARAL Pro-Choice America, a Strategist and Director of Policy at a boutique Washington DC consulting firm, and a Senior Policy Associate at the U.S. Chamber of Commerce.  Marie received her BA in Urban Studies and Sociology from Vassar College, and her JD from George Washington University’s National Law Center. 

Sarah Zlotnik, MSPH, MSW
Program Officer

Sarah joined Stoneleigh's staff in 2015.  Before coming to Stoneleigh, Sarah spent seven years at the PolicyLab at Children’s Hospital of Philadelphia, where she was a founding member and on PolicyLab’s leadership team.  At PolicyLab, Sarah worked to build its "evidence to action" impact strategy and oversee the center's behavioral health and child welfare portfolios.  She has led policy and strategy projects in Philadelphia and nationally, with her most recent work focusing on cross-system efforts to improve education and mental health care for children in the child welfare system.  During her time at PolicyLab, Sarah also served as the public health advisor to the Federal Commission to Eliminate Child Abuse and Neglect Fatalities and taught in the University of Pennsylvania School of Medicine's Master of Science in Health Policy program.  She holds an MSW and an MS in Public Health from the University of North Carolina-Chapel Hill, and a BA from Swarthmore College.