He gained attention for his creations, particularly Kermit the Frog, Rowlf the Dog and Ernie and he was involved with Sesame Street for over 20 years.
Acadou fama polas súas creacións, especialmente Kermit the Frog, Rowlf the Dog e Epi e Blas, coas cales traballou en Sesame Street durante 20 anos.