https://www.metv.com/stories/russell-johnson-only-lost-his-temper-once-says-bob-denver

The only person that irked Russell Johnson was Mr. Warmth himself.

Bob Denver said that Russell Johnson had the hardest job on Gilligan's Island (https://www.metv.com/stories/bob-denver-said-that-russell-johnson-had-the-hardest-job-on-gilligans-island)

The Professor had an unenviable role.