Kameny in 2010 (Sarah L. Voisin/WASHINGTON POST)

Kameny was a founding member of Washington’s first gay civil rights organization, the Mattachine Society, coining the “Gay is Good” slogan in 1968 and serving as a leading strategist in the movement for decades.

PHOTOS: The life of Frank Kameny

Kameny died on National Coming Out Day, a movement started by the Human Rights Campaign. Supporters are taking to Twitter to remember him:

@dcist_martin I started going to GLAA meetings in 1992 because I found out Frank Kameny would be there. I met him in 1988 or so.Wed Oct 12 00:58:19 via TweetDeckBob Summersgill

I could sit here quoting GLBT history texts on Kameny all night. Not sure anyone in homophile movement changed America more. A total giant.Wed Oct 12 00:57:30 via TweetDeckTyler Green

Wow. LGBT rights pioneer Frank Kameny has passed. And on national coming out day. Sad and poignant.Wed Oct 12 00:58:05 via Twitter for iPhoneMorgan P. Corr

One of my heroes. MT @WashingtonBlade Friends of Frank Kameny have confirmed to Blade that the founder of our movement passed away today.Wed Oct 12 00:46:40 via TweetDeckTyler Green

At Frank Kameny Way at 17th and P Streets in Dupont Circle in Washington, D.C. #RIP #DC http://t.co/w0gqHkyHWed Oct 12 01:20:36 via Twitter for BlackBerry®Michael K. Lavers