Sam was married to Jan, a former television reporter for 30 years until they decided to get separated in 2012 with a divorce action. They had four children Samuel Donaldson III, Jennifer, Thomas, and Robert Donaldson. In 2014, he was married to his wife Sandra Martorelli Donaldson.
In 1961, Sam Donaldson earned his first job as a Reporter and an Anchor for WTOP-TV, Washington, D.C. He continued working there until 1967.
Sam was the anchor for 20/20 since 1998. He started his show The Sam Donaldson Show -- Live in America host since October 2001. In 2004 May he became an anchor for "Politics Live". Again in October 2013, he retired from ABC news at the age of 79.
In 2022, Sam's net worth in the U.S $ 50 million. His nationality is American and his ethnicity is white.