What happen to the cast from Marcus Welby MD?

After "Marcus Welby, M.D." ended in 1976, the cast members pursued various paths. Robert Young, who played Dr. Welby, continued acting in television and film, but later retired and became an advocate for mental health awareness. James Brolin, who portrayed Dr. Steven Kiley, found significant success in both film and television, including roles in "The Amityville Horror" and "North and South." Other cast members had varied careers, with some continuing in acting while others moved into different fields or less public roles.