Tretter was also the host of KFAI radio show Night Rivers, and the co-chair of the Minnesota Gay and Lesbian Olympic Committee.

[4] After dropping out of university, Tretter worked at a home in Ramsey County for people with disabilities, while also undertaking private study on gay and lesbian history.

[4] The committee sent the third biggest delegation to the games and Tretter arranged for the torch run to pass though the Twin Cities.

[4] Tretter helped to develop the LGBTQ+ scene in Minneapolis, including establishing Twin Cities Pride, co-founding the Minnesota Committee for Gay Rights, and serving as manager of the Noble Roman and other gay bars across the Twin Cities.

[5][6][7] Tretter's LGBT collection grew over the decades and he donated it to the Andersen Library in Minnesota in 2000.