Jonathan Ned Katz (born 1938) is an American historian of human sexuality who has focused on same-sex attraction and changes in the social organization of sexuality over time. His works focus on the idea, rooted in social constructionism, that the categories with which society describes and defines human sexuality are historically and culturally specific, along with the social organization of sexual activity, desire, relationships, and sexual identities. Early life Katz graduated from The High School of Music & Art in New York City with a major in art in 1956. Since 2004, he has begun to emerge publicly as a visual artist. He went on to study at Antioch College, the City College of New York, The New School, and Hunter College. As a teenager, Katz was featured in Life magazine for his efforts to create a film version of Tom Sawyer. Career Katz taught as an adjunct at Yale University, Eugene Lang College, and New York University, was the convener of a faculty seminar at Princeton University, and was a keynote speaker at Harvard University. He is a founding member of the Gay Academic Union in 1973 and the National Writers Union in 1980. He was the initiator and is the director of OutHistory.org, a site devoted to lesbian, gay, bisexual, transgender, queer, (LGBTQ) and heterosexual history, that went online in September 2008, and was produced in its first four years by the Center for Lesbian and Gay Studies, an institute at the City University of New York Graduate Center, under a grant from the Arcus Foundation. Since 2012, the site has been co-directed by Katz and others. Katz received the Magnus Hirschfeld Medal for Outstanding Contributions to sex research from the German Society for Social-Scientific Sexuality Research in 1997. In 2003, he was given Yale University's Brudner Prize, an annual honor recognizing scholarly contributions in the field of lesbian and gay studies. His papers are collected by the manuscript division of The Research Libraries of The New York Public Library. He received the Bill Whitehead Award for Lifetime Achievement from Publishing Triangle. In 1975 the book series, Homosexuality: Lesbians and Gay Men in Society, History, and Literature: Documents of the Homosexual Rights Movement in Germany, 1836-1927 (Arno Press), which he edited received the American Library Association's Gay Book Award, a "grassroots acknowledgment honoring hallmark works in GLBT publishing". Katz's historical work focuses on same-sex and different-sex relationships, and