His newest book, The Heart of Caring: a life in pediatrics will be published January 18, 2022 and is a collection of heartfelt personal stories from his forty years of experience caring for the needs of children and their families.

In addition he weaves in the struggles he has seen fighting the good fight due to the ongoing corporatization of the American health care system.

Mark Vonnegut is married to Barbara Maria Sibert Vonnegut. He has three sons and loves to paint, make furniture, play the saxophone, and walk his dogs.