 Henson credited them both with developing much of the humor and character of his Muppets.He and Oz developed a close friendship and a performing partnership that lasted until Henson's death; their teamwork is particularly evident in their portrayals of Bert and Ernie, Kermit and Miss Piggy, and Kermit and Fozzie Bear.In New York City, Henson formed a partnership with Bernie Brillstein who managed Henson's career until the puppeteer's death.