Norman Lloyd
Norman Lloyd  was the actor who played Professor  in the  sixth season episode . However, he is probably best known to television audiences for playing Doctor Daniel Auschlander on the drama series St. Elsewhere from 1982 through 1988. Among his co-stars on this popular series were fellow Trek actors William Daniels, Ed Begley, Jr., Ronny Cox, Chad Allen, Jane Wyatt, France Nuyen, Brian Tochi, Deborah May, Alfre Woodard, David Birney, and Bruce Greenwood.

Lloyd began his career in show-business performing in theater before  cast him as Frank Fry in the 1942 film, Saboteur (which co-starred Ian Wolfe). He would work with Hitchcock again in the latter's 1945 masterpiece, Spellbound, before being assigned as a producer on Hitchcock's anthology series, Alfred Hitchcock Presents (later The Alfred Hitchcock Hour). Lloyd would also direct as well as appear in episodes of the program, and from this point until 1979, Lloyd not only continued to act, but to produce and direct for television and for the stage, as well.

As an actor, Lloyd appeared in several popular films. Most notable among these are A Walk in the Sun (1945), The Southerner (1945), The Green Years (1946, with Dean Stockwell), Reign of Terror (1949, with Arnold Moss), 's Limelight (1952, with Leonard Mudie), Audrey Rose (1977, directed by Robert Wise), Dead Poets Society (1989, with Kurtwood Smith), Amityville: The Evil Escapes (1989 TV movie, with Jane Wyatt, Aron Eisenberg, and Warren Munson), Kubato (1992, with John Rhys-Davies), The Age of Innocence (1993), The Adventures of Rocky & Bullwinkle (2000, with Jason Alexander, Whoopi Goldberg, and Max Grodénchik), and the 2000 made-for-TV movie Fail Safe (with James Cromwell and Bill Smitrovich). He had a supporting role in the 2005 romantic comedy In Her Shoes.

Lloyd also had recurring roles in the television series Wiseguy and The Practice, and was a regular on the science fiction series Seven Days from 1998 through 2000, alongside Alan Scarfe. Other series he appeared on include Kojak, Murder, She Wrote, Wings (starring Steven Weber), and Quincy, M. E. (starring Garry Walberg and Robert Ito). Lloyd's later work includes the 2015 hit comedy Trainwreck in which film actor Bill Hader was the male lead.

From October 2017 until his death, Lloyd was the oldest living known actor to have appeared in the Star Trek franchise, following the death of Star Trek background actor Dick Cherney, who was only two days his senior. He is only the sixth Star Trek performer to reach the age of 100, following Viola Stimpson, Ellen Albertini Dow, Olaf Pooley, Shep Houghton, and Cherney. Of this group, Lloyd was the first Star Trek performer to reach and exceed the age of 103. With Lloyd's death, Marsha Hunt became the oldest living Star Trek performer.

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Performers
TNG performers