Jan Trepczyk was a Kashubian poet, songwriter, ideologist, lexicographer, and teacher. He was a member of the Regional Kashub Association of Kartuzy, of the "Zrzeszeńcy" ("associationists"), and of the Kashubian-Pomeranian Association. He compiled a Polish-Kashubian dictionary and co-founded the Kashubian-Pomeranian Literature and Music Museum in Wejherowo.