Born in Neumünster, Mohr studied voice at the Musikhochschule Lübeck from 1980 with Karl Heinz Pinhammer,[1] and graduated in 1985[1] with distinction in the Konzertexamen (concert exam).
[1] He was engaged as a baritone at the Theater Bremen (1985 to 1997) and Nationaltheater Mannheim, and then moved to the Oper Bonn in 1990,[1] where he collaborated with notable directors such as Giancarlo del Monaco, Jürgen Rose, Werner Schroeter, András Fricsay and Andreas Homoki [de].
A review noted: "Thomas Mohr as Loge was a standout, his tenor full of colour and flexibility, revealing the complex character of a trickster who is also a sympathetic demigod.
His clear and ringing high notes cut through the orchestra; his legato made me realize that Wagner could be sung as Mozart.
[12] He founded a festival there in 1996, named KKKK, which is short for Klein Kummerfelder Kuhstall Konzerte (Kleinkummerfeld cow stables concerts).
It features concerts of a wide repertoire from Baroque to Pop,[13] held in the open air (weather permitting) and in the whitewashed cowshed.
[14][15] In 1993, Mohr was part of a complete recording of Busoni's opera Arlecchino, conducted by Kent Nagano, in the role of Ser Matteo del Sarto.