Glenn Mendelson is the son of producer\director Lee Mendelson. He provided the voice of Schroeder in Charlie Brown's All-Stars, but he was uncredited for it. He later worked as a production assistant\coordinator and in business affairs for the Peanuts TV series The Charlie Brown and Snoopy Show and This Is America, Charlie Brown and in the Peanuts TV specials It's Flashbeagle, Charlie Brown Snoopy's Getting Married, Charlie Brown, You're a Good Man, Charlie Brown, Happy New Year, Charlie Brown!, Snoopy: The Musical, You Don't Look 40, Charlie Brown, Why, Charlie Brown, Why?, Snoopy's Reunion, It's Christmastime Again, Charlie Brown, You're in the Super Bowl, Charlie Brown, It's Spring Training, Charlie Brown, It Was My Best Birthday Ever, Charlie Brown, It's the Pied Piper, Charlie Brown,