Katie Williams

Chief Operating Officer


Katie Williams joined Florida Impact in 2017 as the Projects Manager. In her previous role as the Program Manager of Healthiest Weight Florida at the Florida Department of Health, she facilitated a collective impact approach to preventing chronic diseases through policy, systems, and environmental changes aimed at making the healthy choice the easy choice for all Floridians. Prior to this, Katie served as the Marketing and Outreach Coordinator for Florida’s Early Steps Program. She also has experience working in child care licensing and non-profit development. Katie attended Florida State University obtaining a bachelor’s degree in Family and Child Sciences and a master’s degree in Public Health.

Contact Katie at kwilliams@flimpact.org

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Sam Hopwood

Regional Director of South Florida


Sam Hopwood joined Florida Impact in 2017. Before officially joining the team, he helped with the development of the Why Breakfast is Important white paper. Sam completed a BS in Biology and a BA in Spanish from the University of New Mexico in 2014, and is currently pursuing a Master of Public Health (MPH) degree at the University of Miami, to be completed in Spring 2018. Sam had previously interned with Nourish International, Project Amazonas, and the Nature Conservancy on developing and implementing multiple community-based public health projects both here in Miami-Dade County and further afield in Latin America and Africa. Sam is committed to tackling nutritional barriers and health disparities across South Florida, and ensuring that all children are given an equitable opportunity to succeed and thrive.

Contact Sam at shopwood@flimpact.org


Kelli greene

Administrative Coordinator


Kelli Greene joined the Florida Impact team in January of 2019 after completing two AmeriCorps terms with the Florida Conservation Corps. Prior to working with AmeriCorps, Kelli worked at the Florida Department of Health for four years as an Administrative Assistant at the Division and Bureau level organizing meetings, managing purchases, acting as the Human Resource liaison, and providing up-to-date correspondence. Kelli brings enthusiasm to get things done for Florida and her team by learning everything she can in her role as Administrative Coordinator. In her spare time, Kelli enjoys exploring the outdoors through hiking, kayaking and swimming.

Contact Kelli at kgreene@flimpact.org

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Graphic Designer

Raffaela Susi has been on the Florida Impact team since 2011. When she joined as a Program Assistant, her main responsibilities were designing flyers and other publications, maintaining company social media, and answering calls for the Florida Summer Food Hotline. She became the Communications Coordinator in 2012 after spearheading an entire rebranding of the organization. In 2015, Raffaela moved to Seattle and was kept on as the remote Graphic Designer. She has designed all websites and most publications produced by Florida Impact, and continues with new projects to this day.

Contact Raffaela at raffaela@mail.com


Shirbrina Jefferson 

Hunger Free America Summer Associate


Shirbrina Jefferson joined the Florida Impact to End Hunger team in the summer of 2019. She graduated from Rutgers University where she studied environmental policy and public health. Her work in the Summer BreakSpot program and the Florida Healthy Retail initiative points to her passion for community development and strengthening vulnerable populations. She works closely with said populations and local small business owners to facilitate nutrition programs and ensure community needs are met. 

Contact Shirbrina at smj158@scarletmail.rutgers.edu