Gregg received a 2007 Tony Award nomination for his work on Legally Blonde the Musical. West End credits include Pageant for which he received an Olivier nomination.
His Broadway credits are, The Drowsy Chaperone (2006 Tony Award, Drama Desk Award, Outer Critics' Circle Awards); Dirty Rotten Scoundrels; Flower Drum Song (Tony nomination); and Side Show. Other credits include Sinatra (Radio City); Follies (Encores!); The Kathy and Mo Show; Pageant; The Radio City Christmas Spectacular; and Cinderella and The Merry Widow for NYC Opera.
Touring and Regional credits include Dirty Rotten Scoundrels; On the Record; Ringling Bros. Circus; Mame (Kennedy Center); Flower Drum Song (Mark Taper, L.A. Drama Critics' Award); Allegro (Signature Theatre, Helen Hayes Award) and Lucky Duck (Old Globe, San Diego Critics Award).
Gregg spent nine years as the resident costume designer for the Paper Mill Playhouse and was awarded the TDF Young Master Award.