Pernell Roberts was a stage, movie and television actor, as well as a
singer. In addition to guest starring in over 60 television series, he was
widely known for his roles as Ben Cartwright’s eldest son, Adam Cartwright,
on the western series Bonanza, a role he played from 1959 to 1965 and as
chief surgeon Dr. John McIntyre, the title character on Trapper John, M.D.