Dorsey has served in two presidential administrations as a White House Fellow and Special Assistant to the U.S. Secretary of Labor (1997-98); Special Assistant to the Director of the Women's Bureau of the U.S. Labor Department (1998-99); Transition Team Member of the Innovation and Civil Society subgroup of the Technology, Innovation, and Government Reform Policy Working Group (2008-09); and Vice Chair for the President's Commission on White House Fellowships (2009-present).
Dorsey serves on several boards including the Harvard Board of Overseers, the SEED Foundation, and Northeast Bank. In 2009, Dorsey was named one of "America's Best Leaders" by US News & World Report and the Center for Public Leadership at Harvard Kennedy School. For 2010 and 2011, she was named as one of The Nonprofit Times' "Power and Influence Top 50."
Dorsey received her Bachelor's degree in History and Science magna cum laude with highest honors from Harvard-Radcliffe Colleges, her medical degree from Harvard Medical School, and her Master's in Public Policy from Harvard Kennedy School. She completed her pediatric residency at Children’s National Medical Center in Washington, DC.