Frank Kameny, who died last month, will be honored with a Capitol Hill memorial service.
Members of Congress and the Obama administration are expected to honor Kameny on Tuesday.
The public service is scheduled for 4:30 p.m. in the Cannon House Office Building.
Kameny died October 11 in his Washington home. He was 86-years-old.
He spent most of his life fighting for gay and lesbian equality after the federal government fired him for being gay in 1957.
Today marks the 50th anniversary of Kameny’s co-founding of the Mattachine Society of Washington. It is considered the first gay rights group in the nation’s capitol.