John Marshall is a real person portrayed by Jack Gwaltney in the TV series John Adams (based on a true story).
In the first episode they appeared in, titled Unnecessary War (season 1), they were 47 years old.
They appear in 1 episodes out of a total of 7 aired
Episodes1
Unnecessary War
episode S1.E6 april 2008After Adams becomes President continues Washington's policy of neutrality between England and France despite opposition inside his own cabinet.