Don Louis Agrati, known professionally as Don Grady, was an American actor, composer, and musician, who gained fame as a Mouseketeer on Mickey Mouse Club. He contributed vocals for songs on several Disney's Sing-Along Songs media releases. He also appeared for Mouseketeer reunions, such as The Mickey Mouse Anniversary Show (alongside Annette Funicello) and The Mickey Mouse Club Story. He also wrote and produced songs for the Disney Princess franchise.
Don was born in San Diego, California, but grew up in Lafayette, California. He was a musical prodigy, and had mastered several instruments by the time auditions for Mickey Mouse Club began in San Francisco for new Mouseketeers in its new season. Director Sidney Miller spotted Don and signed him up. Despite showcasing his acting and singing props on the show, Don's skills with instruments were not as utilized. He was among the cast members hired in 1958, and later changed his last name to "Grady".
While continuing his acting career, Grady went to and graduated from Burbank High School in 1962. He appeared in television guest spots, such as The Restless Gun, Have Gun – Will Travel, Wagon Train, The Rifleman, Dick Powell's Zane Grey Theatre, and Mr. Novak. However, he found new fame by 1960 as Robbie Douglas on the ABC/CBS sitcom My Three Sons, which included Disney alumni Fred MacMurray, Tim Considine, and Cheryl Holdridge. During this time, he continued his music career playing with several bands in films.
After leaving My Three Sons, Grady pursued a musical career performing in shows, such as Pippin, Godspell, and Damn Yankees, as well as composed music for films and television.
Nineteen days after his birthday, he died of myeloma at age 68 in Thousand Oaks, California, and was buried at the Pierce Brothers Valley Oaks Memorial Park in Westlake Village, California.