in the early 1930s hamelin returned to france, where he was active as a soloist and private teacher. he published his "scale and exercise book" in paris. his pedagogical approach was notable for advocating a double-lip embouchure, which was less common than the single-lip variety but was credited with reduced biting and increased fluidity of tone. his students included rosario mazzeo, joseph allard and ralph mclane. he is known as a founder of the "american" school of clarinet and is credited with having a significant influence on the development of performance practice in the united states.