I've removed this section as I don't believe Sellers worked with Wilder or Polanski. The rest is a list of actors, but anyone with a long film career will have worked with lots of other stars, so I'm not sure how relevant it is: 

 "Other directors Sellers worked with include Roman Polanski and Paul Mazursky. He appeared with many stars, among them Shirley MacLaine, Sophia Loren, Maggie Smith, Goldie Hawn, Shelley Winters, Elke Sommer, Claudine Longet, and even Ringo Starr (The Beatles' drummer)."