In the very first LIS episode, Dr Smith appears to be a medical doctor. He also occasionally acts as a doctor throughout the show. But he also has programming skills (as seen in the first episode onwards) and has reasonable mathematical skills (as demonstrated when he was mistaken for Zeno and said: "Can Zeno tell you the difference between Differential and Integral Calculus?" So what does Dr Smith actually have his PhD in?

  • 1
    Paedophilia and general creepiness? Apr 3, 2014 at 8:43
  • Note - a medical doctor is not a PhD - they typically hold at least two bachelor degrees. And at least in the UK, the doctor title is dropped for senior consultant practitioners.
    – HorusKol
    Apr 3, 2014 at 22:59
  • 2
    Women's Studies Jun 7, 2015 at 5:00
  • @HorusKol that is true in the UK, where physicians generally earn a MBBS (Bachelor of Medicine, Bachelor of Surgery) degree. Apr 15, 2018 at 10:55
  • Seems to have a doctorate in mischief and subterfuge
    – Anthony X
    Oct 14, 2018 at 16:22

1 Answer 1


Per the excellent "Lost in Space" wiki, in episode 3 ("The Kidnapped of Space") it specifically states that

Dr. Zachary Smith is a Doctor of Intergalactic Environmental Psychology

In the TV show, he also claims to be a medical doctor, a psychologist and a psychiatrist. Whether this is simply bluster or whether these are aspects of his PhD is not made clear.

In the 1998 film script, his role seems to be more focused on medicine;

"Doctor Smith is [the] base physician"

  • 1
    I'd forgotten how he always talked about psychology! Apr 3, 2014 at 6:52

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