Regional theaters employing Hilferty's costumes have included the Guthrie Theater, La Jolla Playhouse, Goodman Theatre, Court Theatre, Berkeley Rep, Yale Rep, McCarter Theatre, Alliance Theatre, Indiana Rep, Kennedy Center, Williamstown Theatre Festival, and American Conservatory Theater.
Broadway theatre | Sundance Film Festival | West End theatre | musical theatre | Cannes Film Festival | Royal National Theatre | theatre | Royal Court Theatre | American Ballet Theatre | Toronto International Film Festival | Glastonbury Festival | Musical theatre | National Theatre | Theatre Royal, Drury Lane | Edinburgh Festival | Royal Festival Hall | Venice Film Festival | Bolshoi Theatre | festival | Tribeca Film Festival | Abbey Theatre | Haymarket Theatre | Salzburg Festival | Montreux Jazz Festival | Williamstown, Massachusetts | Theatre Royal | Play (theatre) | Globe Theatre | Edinburgh Festival Fringe | Theatre |
He has worked with the Mark Taper Forum, South Coast Repertory, Empty Space Theatre, Seattle Rep, Cornerstone Theatre Company, Pasadena Playhouse, Geffen Playhouse, Williamstown Theatre Festival, A Noise Within (where he received both Dramalogue and LADC awards), Interact Theatre Company, Shakespeare Theatre of New Jersey, Manhattan Theatre Club, Yale Repertory Theatre, and many others.
Series,he was seen as Woof in Hair and Peter in Babes in Arms and has performed regionally at The Berkshire Theatre Festival, NY Stage and Film, The Guthrie Theatre, and The Williamstown Theatre Festival.