Legendary cartoonist William Hanna has died at his home in Los Angeles at age 90. Hanna, along with his partner of over 50 years, Joseph Barbera, created some of the world's best known and most beloved cartoon characters, including Tom and Jerry, the Flintstones, Scooby-Doo, Snagglepuss, Yogi Bear, Huckleberry Hound, and many, many others. Hanna got his start as a lyricist and composer with Harmon-Ising Studios, the company that created the Looney Tunes and Merrie Melodies cartoon series, in the early 1930s. In 1937 Hanna moved to MGM and soon afterward partnered with Barbera. Their first success was "Puss Gets the Boot," a cat and mouse cartoon that earned an Academy Award nomination and provided the genesis for Tom and Jerry. Between 1943 and 1952 the team won seven Oscars for their animated shorts. After MGM closed its animation division in the 1950s, Hanna and Barbera formed their own company and moved to television, producing numerous successful animated comedies. Probably the best known of these were the Flintstones, a parody of the Honeymooners and the first prime-time cartoon series, and Yogi Bear, who was modeled after Phil Silvers' Sergeant Bilko. Over the years since its creation in 1957 the Hanna-Barbera company developed over 150 cartoon and live-action television series and produced more than 5,000 TV animations, winning eight Emmys in the process. As a testament to the continued appeal of Hanna and Barbera's characters, the Cartoon Network recently created the Boomerang cable network, which exclusively showcases the Hanna-Barbera library.