He made his American debut as a soloist with the Württemberg Chamber Orchestra
as it toured. After then, he had an active concertizing, touring, and recording career that embraces virtually the entire period of trumpet solo music from Baroque to avant-garde. He was a particular champion of the Baroque repertoire and important in popularizing the use of the small piccolo trumpet (in the keys D or E flat) in such music. He made nearly 300 recordings, including recordings of over 30 concertos. Among the composers from whom he commissioned trumpet works are Jolivet
, and Tomasi. His trumpet playing had the expected virtues of brilliance, power, and endurance, and he combined his technical skills with a warm, even jolly, stage presence. He had a strong interest in the various varieties and makes of trumpets, had built a collection of nearly 100 instruments, and designed a four-valved piccolo trumpet, made by Selmer, which proved to be exceptionally successful among top-rate players. He remained a consultant for Selmer until January 1973. He succeeded his teacher Sabarich as a professor of trumpet at the Paris Conservatory in 1967.