Mattel Matson sold his share to Handler due to poor health, and Handler's wife Ruth took Matson's role. In 1947, the company had its first hit toy, a ukulele called "Uke-A-Doodle". The company incorporated the next year in California. Mattel became the first year-round sponsor of the "Mickey Mouse Club" TV series in 1955. The Barbie doll debuted in 1959, becoming the company's best-selling toy in history. In 1960, Mattel introduced Chatty Cathy, a talking doll revolutionizing the toy industry, which led to pull-string talking dolls and toys flooding the market throughout the 1960s and 1970s. The company went public in
Sheryl Handler tool with which to develop software programs for artificial intelligence. Handler helped found the Thinking Machines Corporation, where she served as CEO until 1992. After the Thinking Machines Corporation went bankrupt in 1995, Handler and several other former employees founded Ab Initio Software. Sheryl Handler Sheryl Handler is an American businesswoman recognized as one of the founders of Thinking Machines and is the founder and current CEO of Ab Initio. Handler attended Case Western Reserve University for interior design and received her master's degree in landscape architecture from Harvard University. Handler had previously participated in the start-up of the Genetics