From The Arthur Conan Doyle Encyclopedia
Mark Zeisler is an American actor who played Arthur Watkins in episode Blood is Thicker of the TV Series Elementary with Jonny Lee Miller as Sherlock Holmes.
In 2018, he played Dr. Watson in the play Sherlock's Last Case with Rufus Collins as Sherlock Holmes.
- 2013 : Elementary: Blood is Thicker (as Arthur Watkins)
- 2018 : Sherlock's Last Case (as Dr. Watson)