(written from a Production point of view)
William "Bill" Lithgow (born 7 August 1939; age 78) is an actor from Los Angeles, California who played Doctor Pran Tainer in the Star Trek: The Next Generation seventh season episode "Inheritance" in 1993. His costume from this episode was later sold off on the It's A Wrap! sale and auction on eBay.  
Lithgow previously appeared in the television drama The Fantastic Seven (1979, starring Christopher Lloyd) and in the television comedy Drop-Out Father (1982, with Mariette Hartley, William Daniels, Bill Erwin, Bruce Gray, George Coe, Richard Penn, and Monte Markham). He then worked for and taught acting for Stella Adler.
More recently, Lithgow had supporting parts in the horror thriller Dead in the Water (2006), the drama A Beautiful Life (2008), and the drama The Inner Circle (2009, with Colby French and Mariette Hartley), worked in several stage plays such as "The 60s" (2006) and "Entertaining Mr. Sloane" (2007) at the Pacific Resident Theater in Venice, California, and worked as researcher on the 2011 short drama The Painted Woman.