Patrick O'Brien has been an full time professional artist and illustrator since the mid-1980s. He worked for clients such as The Smithsonian, National Geographic, and The Discovery Channel. His art has appeared in magazines and newspapers, on posters and greeting cards, and even on billboards.
Patrick entered the marine art field in 2002. He does exhaustive historical and nautical research to ensure that his paintings are as accurate as possible. He has lectured about his work at various venues.
Patrick also teaches part-time at MICA, the Maryland Institute College of Art.
Patrick is the author and illustrator of fourteenchildren's books. These are mostly non-fiction books about things like knights, pirates, ships, and dinosaurs, although he has done a couple of sci-fi books about dinosaurs in space.