After law school at George Washington University in Washington, DC, he worked at the U.S. Equal Employment Opportunity Commission as a trial attorney and subsequently in the Philadelphia District Office as an administrative judge. In Philadelphia, he founded the Center for Lesbian and Gay Civil Rights and served as its executive director for five years. The Center’s legal programs (now the Mazzoni Center) provided legal services and education to LGBT people in Pennsylvania, as well as launched the nation’s first LGBT legal clinic in conjunction with the University of Pennsylvania. The advocacy programs (now Equality Pennsylvania) spearheaded a coalition to defeat an anti-gay ballot initiative and pass domestic partnership legislation in Philadelphia.
Mr. Park was an adjunct faculty member at the University of Pennsylvania Law School, the George Washington School of Law, and was a field instructor for the Bryn Mawr School of Social Work. He has served as an officer at the Gay and Lesbian Attorneys of Washington, DC, the National Council of EEOC Locals, AFGE, AFL-CIO, the Liberty City Democratic Club, the Gay and Lesbian Lawyers of Philadelphia, and a number of other boards. He has won several awards for community service including being named honorary Grand Marshall of the Philadelphia Gay Pride Parade.