Gregor was made an honorary member of the Geological Society of London on its inception in 1807, and was a founding member of the Royal Geological Society of Cornwall in 1814. His friends and correspondents included John Hawkins, Philip Rashleigh and John Ayrton Paris. Never letting his scientific work interfere with his pastoral duties, he was also a distinguished landscape painter, etcher and musician. He died of tuberculosis on 11 June 1817 and was buried at nearby Cornelly church.