(born 1953), Irish Michelin starred head chef of Arbutus Lodge Michael Ryan (mass murderer) (1960–1987), perpetrator of the Hungerford massacre Michael J. Ryan (doctor) (born 1965), Irish doctor and chief executive director of the WHO Health Emergencies Programme Michael J. Ryan (biologist), American biologist J. Michael Ryan, associate judge on the Superior Court of the District of Columbia Michael A. Ryan, U.S. Army general See also Mick Ryan (disambiguation)