Forgetting Sarah Marshall star Jason Segel seeks adventure with Jonah Hill Jason Segel is attached to star alongside Jonah Hill and Jason Schwartzman in “The Adventurer’s Handbook”. The comedy follows four childhood friends who are bored with the monotony of their lives and embark on a global adventure. The Uproject is inspired by the stories of explorers detailed in Mick Conefrey’s book “The Adventurer’s Handbook: Life Lessons From History’s Great Explorers.” Universal picked up the book rights as well as the script in February. Hill co-wrote the script with Matt Spicer and Max Winkler. Akiva Schaffer is directing. Segel will play a talented musician who never got his act together, becoming a backup piano player and an alcoholic; Hill plays an engineer, isolated from his family; Schwartzman is a spoiled and cowardly three-time Grammy winner.