People You Should Know . . . Seth Shelden
SETH SHELDEN is a nativeBrooklynite and a resident actor at Ground UPProductions, which he co-founded in 2005. Over the pasteighteenyears or so, he's performed in numerous films, plays, musicals,commercials, and the like. Later this month, he'll be actingin BlastRadius, a new play byMac Rogers (opening March 30th) that's thesecond episode of The Honeycomb Trilogy. Some of his otherfavoritestage cred…