Seattle Times by Melinda Brown- August 2009- Seattle Opera/Siegfried-"...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."

Opera Warhorses- August 2009-Seattle Opera/Siegfried- "..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..."

Chicago Tribune by John von Rhein - February 19, 2007- Lyric Opera of Chicago/Dialogues des Carmelites- “…and that wonderfully natural singing actor, tenor Dennis Petersen, as the chaplain, desperate to maintain order and devotion in the face of impending doom.”

Sun Times by Andrew Patner-February 19, 2007-Lyric Opera of Chicago/ Dialogues des Carmelites- “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.”

Opera News by Mark Thomas Ketterson-March 2007-Lyric Opera of Chicago/Die Fledermaus- “Dennis Petersen’s charming Blind managed to stutter with perfect intonation.”

Opera News by Mark Thomas Ketterson-March 2006-Lyric Opera of Chicago/Die Zauberflote- “Dennis Petersen’s excellent, refreshing lyrical Monostatos avoided exaggeration…”

Sun Times by Laura Enerick-December 18,2006-Lyric Opera of Chicago/Die Fledermaus-"....tenor Dennis Petersen nailed the stuttering Dr. Blind..."

Opera News by Mark Thomas Ketterson-February 2005-Lyric Opera of Chicago/The Cunning Little Vixen- “Standouts in the very consistent ensemble included Dennis Petersen’s poignant transition from the boozy Mosquito to heartbroken schoolteacher…”