In 2008 he sang the title role in Faust at the Croatian National Theatre in Split, and in the same season he made his debut in the role of the Prince in Rusalka at The National Theatre Brno. This was the start of Peter‘s association with this theatre, where he has been a soloist since the 2008/9 season in roles including Ismael in Nabucco, Alfredo in La Traviata, Lenski in Eugene Onegin and Michel in Martinů’s Julietta. In 2009 Peter made his first guest appearances at the National Theatre and the State Opera Prague in the roles of Pinkerton and the Prince in Rusalka respectively.
In addition to his operatic work Peter Berger is a prolific concert artist, and has sung with the Slovak Philharmonic Orchestra as well as the State Philharmonic Košice, Prague Philharmonia, Brno Philharmonic, Bohuslav Martinů Philharmonic Orchestra, and the Czech Virtuosi. He has performed in many domestic and foreign concerts as well as being a permanent guest at the festival “Viva il Canto“ in Czeszyn, Poland and at the international festival in Sopron, Hungary. His concert repertoire includes the Glagolitic Mass, Puccini’s Messa Di Gloria, Rossini’s Petite Messe Solennelle, the Mozart Requiem and Masses as well as Beethoven’s Ninth Symphony.
In the 2011/2012 season he successfuly played the role of Prince in Dvorak’s Rusalka in the New National Theatre, Tokyo, and performed Janacek’s Glagolitic Mass under Jaroslav Kyzlink with the Aarhus Symphony Orchestra and under Sir Mark Elder with the Hallé Orchestra in San Sebastian. In the 2012 Peter made his dèbut with The Slovak National Theater in Bratislava as Laca in Janáček´s Jenůfa. For this role he was also awarded The Slovak Literary fund prize.
In the autumn 2012 he made his dèbut at the Glyndebourne Festival as Prince in Dvořák´s Rusalka.
Engagements in the 2012/2013 season included playing the role of Duca in Verdi´s Rigoletto in the State Theater in Košice, playing the role of Boris in Janáček´s Káťa Kabanová with Danish National Opera and performing Rossini´s Stabat Mater under Jaroslav Kyzlink with the National Theatre in Prague.