Marshall "Buzz" Potamkin (October 22, 1945 – April 22, 2012) was an American television producer and director known for founding his own television advertisement production studio, Perpetual Motion Pictures aka Buzzco Associates, and helping to establish Southern Star Productions. Along with advertisements, Potamkin focused on producing made-for-television animation, beginning with several television films based on the Berenstain Bears series of children's books. He went on to produce series for Turner Entertainment and, more specifically, Cartoon Network, including every episode of Cartoon Network's animated showcase series, What a Cartoon!, a project developed for aspiring animators to make pilot shorts that the network could choose to develop into full-fledged series.