Before joining, in 1998, Gay & Lesbian Alliance Against Defamation (GLAAD) as Entertainment Media Director, Seomin worked for GTSP Records, a label owned and operated by musician and television personality John Tesh, and distributed by PolyGram, where he was director of media relations. He began his work in television, serving as the first public relations manager for cable's E! Entertainment Television, and later as director of publicity at Warner Bros. Domestic Television Distribution.

He was also the longtime director of media relations for Entertainment Tonight, where he began his seven year association with Tesh. A former field reporter for Extra, Seomin has been a contributing feature writer for lesbian and gay print publications including Los Angeles' Edge magazine, Chicago's Windy City Times, Cleveland's Gay People's Chronicle, the San Francisco Bay Times, Philadelphia Gay News and OutFront Colorado.