During his time in New York Schneller developed and managed the Computer Music Studio at the Graduate Center of CUNY and taught harmony and counterpoint at Baruch College].
Master classes with Salvatore Sciarrino, Jonathan Harvey, Brian Ferneyhough, George Benjamin, and Vinko Globokar provided important orientations.
As a saxophonist, he has performed with the George Russell Big Band, the Gustav Mahler Youth Orchestra under Seiji Ozawa, with the Tanglewood Music Center Orchestra as a soloist in Tan Dun's "Red Forecast", as well as with musicians such as Steve Drury, Heather O'Donnell, Jiggs Whigham (Big Band), Bernhard Lang, Ned McGowan, Robin Hayward, Vinko Globokar, and Gert Matthias Wegner.
In 2005 he was the curator of the project The Musical Moment at Berlin's House of World Cultures featuring composers Toshio Hosokawa and Helmut Lachenmann.
From 2009–2010 Schneller held a professorship in composition at the State University of Music and Performing Arts Stuttgart as a sabbatical replacement for Prof. Marco Stroppa.