As a pianist, he had the opportunity to play with numerous renown jazz musicians, such as Chet Baker, Joe Lovano, Joe Henderson, Bill Frisell, Archie Shepp, Art Farmer, Johnny Griffin, Pepper Adams, John Abercrombie, etc...
He also played with the cream of European and Belgian jazz musicians.

He accompanied Toots Thielemans for almost two decades in the whole world.

Michel Herr has also been active as a composer and arranger and gained an international reputation in that field.
He wrote for his own bands (trio, quintet, nonet, etc...) as well as for prestigious European ensembles, a.o.the WDR, NDR Big Bands, the Metropole Orchestra, the Brussels Jazz Orchestra, as well as for ensembles of various formats : strings, chamber and symphony orchestras, choir, etc...

Michel Herr also wrote music scores for movies ("Just Friends") and television.

He has an impressive discography (more than 100 albums) as a pianist (leader or sideman) but also as a composer and arranger.
Among others : trio, quartet & quintet albums, "The Music of Michel Herr", a double cd of his compositions for jazz big band recorded with the Brussels Jazz Orchestra and "Positive", which features his music for sextet and string quartet and for which he received the Sabam Jazz Award.