Péter Keserű was born in Kiskunfélegyháza, Hungary in 1977.
He received his first horn lessons from Ferenc Jankovszki in 1986 at the local music school and later continued his training at the Zoltán Kodály middle school for music in Kecskemét with István Szilágyi. From 1995 to 2001 he studied with Prof. Miklós Kökényessy at the Franz Liszt Music Academy in Budapest. After this he took regular private tuition with Prof. István Vincze in Dresden.
In 1999 he was accepted into the Ernö Dohnányi Orchestra in Budapest as principal horn, a position he also held in the Budapest Concert Orchestra from 2000. From 2002 to 2003 he was principal horn with the Hungarian Symphony Orchestra Budapest and held the same position in the Bruckner Orchestra in Linz under principal conductor Dennis Russell Davies until 2008. Since 2001 he has regularly assisted in the Budapest Festival Orchestra under Iván Fischer.