Mark O'Shea on close encounters with venomous snakes

October 7, 2025·28 min·2 clips

Mark O'Shea was bitten by a rattlesnake six hours from the nearest town, with no radio contact until morning — and he administered cold-chain-broken antivenom that briefly blinded him.

Mark O'Shea arrives with close encounters, but the episode does not just rattle through snake scares. Jim Al-Khalili first places him in herpetology, the branch of zoology concerned with reptiles and amphibians, then lets the life story wander into the less tidy parts: missed chances, thin finances, big trips, and a stubborn pull toward fieldwork. The childhood fascination did the early pushing. O'Shea dropped out of college in his teens, then later found his way to Wolverhampton Poly as a mature student. He says he had not really imagined the degree was possible, which gives the 1985 graduation a bit of bite. It was not a clean academic climb. Borneo got in the way, or maybe opened the door. A seven-man expedition organised during his studies put him in contact with a major at the War Office, and Operation Raleigh, now Raleigh International, gave him a path into larger overseas projects where young venturers learned field techniques. Honduras came first. Papua New Guinea followed in 1986, then Cameroon in 1989. Each trip took months, and the money sounded painfully close-run. Al-Khalili notes savings from a hospital job and help from O'Shea's parents; O'Shea admits the next expedition ate what he had. Then the Amazon called. The Royal Geographical Society wanted him as herpetologist on a 13-month Brazilian fieldwork project, another lurch forward in a career built by persistence more than planning. Venom stays in the background and sometimes the foreground. His work helped medical scientists study venom effects and possible antidotes from some of the world's deadliest snakes. Recognition came too: an MBE, a snake species named for him, and a PhD nearly finished at 69. The ending lands softly, with O'Shea treating achievement as a way to give life meaning and imagining his parents' pride.

As heard by us

A snake scientist's life story that connects field danger with patient, practical science.

Mark O'Shea's story is shaped less by snake spectacle than by a boyhood curiosity that turned into fieldwork, teaching, and steady scientific purpose.

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Why you'd press play

A snake scientist's life story with fieldwork, venom, and a very late PhD.

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