"Dennis Petersen has emerged as one of the handful of superb character tenors, and his portrayal of the Siegfried Mime (the largest part in Siegfried other that the hero himself) was masterful." 
                                                                                               —Opera Warhorses on Seattle Opera’s Siegfried, 2009


“[On] Dennis Petersen as the nasty dwarf Mime . . . Petersen also made a great impression, using his powerful tenor and his tonal variety to excellent advantage in creating a character unpleasant enough that we forgive Siegfried for dispatching him."  
                                                                                                  —Seattle Times on Seattle Opera’s Siegfried, 2009


“Dennis Petersen’s charming Blind managed to stutter with perfect intonation.” 
                                                                            —Opera News on Lyric Opera of Chicago’s Die Fledermaus, 2007


“American character tenor Dennis Petersen likewise offers a statue-raising performance as the chaplain who both counsels and benefits from the sacrifice of the sisters.” 
                                              —Sun Times (Chicago) on Lyric Opera of Chicago’s Dialogues of the Carmelites, 2007


“That wonderfully natural singing actor, tenor Dennis Petersen, as the chaplain, [was] desperate to maintain order and devotion in the face of impending doom.” 
                                             —Chicago Tribune on Lyric Opera of Chicago’s Dialogues of the Carmelites, 2007

“Dennis Petersen’s excellent, refreshing lyrical Monostatos avoided
exaggeration . . .” 

                             —Opera News on Lyric Opera of Chicago’s Magic Flute, 2006


"Tenor Dennis Petersen nailed the stuttering Dr. Blind." 
        —Sun Times (Chicago) on Lyric Opera of Chicago’s Die Fledermaus, 2006


“Standouts in the very consistent ensemble included Dennis Petersen’s poignant transition from the boozy Mosquito to heartbroken schoolteacher.”
        —Opera News on Lyric Opera of Chicago’s The Cunning Little Vixen, 2005