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  • About Rock Creek Conservancy


Matthew Fleischer, Executive Director


Matthew Fleischer was appointed as Executive Director of Rock Creek Conservancy on February 3, 2014.

Matt brings a new energy to the Conservancy and is tasked with growing the donor base and increasing the impact the organization has on Rock Creek Park and its watershed. The Conservancy is poised for growth and Matt is excited to play a key role in helping Rock Creek National Park celebrate its 125th Anniversary in 2015.

Sarah Mitchell, Development Officer


Sarah joined Rock Creek Conservancy in November of 2012. She completed her Bachelor’s degree at Macalester College in St. Paul, Minnesota. She has worked in marketing, event planning, and fundraising at The Nature Conservancy and Greenpeace as well as the Autism Society. As a native of the Washington, DC area, she grew up near Rock Creek and is having a great time introducing her children to it.

Karen Zeiter, Program Manager


Karen joined Rock Creek Conservancy in August of 2012. She graduated with a Bachelors of Science in Environmental Studies from Towson University and first started working with Rock Creek Conservancy as a Chesapeake Conservation Corps Volunteer. She has worked at the Food and Drug Administration in the Department for Environmental Safety and Strategic Initiative, the Chesapeake Bay Trust, and REI. As an active Outdoor Trip Leader throughout her college career, Karen enjoys outdoor recreation activities such as rock climbing, hiking, and backpacking. Her favorite parts of Rock Creek are Lake Frank and Lake Needwood in the upper part of the watershed, which she encourages all park users to explore.

Erica Carlsson, Program Coordinator- Youth, Education, Health


Erica began working at Rock Creek Conservancy in October of 2015. In this position, she is able to connect people with the natural world in meaningful ways that empower self-improvement and environmental conservation. She joined us from The Exotic Plant Management Team for the National Capital Region of the National Park Service. Previously held positions include Interpretive Ranger at Mount Saint Helen's National Monument (Forest Service), Mount Hood Community College (Youth Conservation Corps) Leader, and Graduate Research Scientist with the University of Florida-Geography Department. She is an experienced outdoor educator, who loves hiking, canoeing, and tackling challenge course                                                 elements in her free time.

Paul Mufarrij, Development & Communications


Paul joined Rock Creek Conservancy in September 2014 as a Volunteer and in February 2015 as the Development & Communications Manager. He was first drawn to Rock Creek while studying at Georgetown University. The mouth of Rock Creek flows into the Potomac River at Mile Zero, along the Georgetown Waterfront. It's a serene spot that Paul often visited. Paul has also logged thousands of miles riding his bike through Rock Creek Park. Previously, Paul worked in the academic publishing and real estate fields.

Sherri Hammerman, Administrative Assistant


Sherri Hammerman joined Rock Creek Conservancy as Administrative Assistant in April 2014. She has a degree in journalism from the University of Georgia and previously worked as a graphic artist at Fahlgren Advertising, USA TODAY and American University, and also taught early childhood music in Bethesda. Sherri enjoys running on the trails near Meadowbrook Park.