Harvard University will endow a visiting professorship in lesbian, gay, bisexual and transgender studies, a position that, it believes, will be the first endowed, named chair in the subject at an American college.

The visiting professorship was made possible by a gift of $1.5 million from the Harvard Gay and Lesbian Caucus, which will formally announce it at a dinner on Thursday, after Harvard’s commencement exercises. With the gift, Harvard said it would regularly invite “eminent scholars studying issues related to sexuality or sexual minorities” to teach on campus for one semester, according to a draft of a university press release.

The chair is being named for F.O. Matthiessen, a Harvard scholar and literary critic who “stands out as an unusual example of a gay man who lived his sexuality as an ‘open secret’ in the mid-20th century,” according to the release.

Professor Matthiessen, the release added, “leapt to his death from the window of a Boston hotel room” in 1950, despondent, at least in part, over the death several years earlier of his partner, the artist Russell Cheney.