He developed Electrical Porcelain with transmission engineers at GE. His family continued to work at Building 68 in Schenectady for decades. William's son Frank Cermak advanced insulator design into the mid 20th century.
When Rex Harrison accepted his Academy Award for My Fair Lady (1964), he dedicated it to his two fair ladies, Audrey Hepburn and Julie Andrews both who had played Eliza Doolittle with him.
A book adaptation by Perdita Finn, titled My Little Pony: Equestria Girls: The Legend of Everfree, has been displayed at the 2016 New York Toy Fair and will be released on September 6, 2016.