[69][70][71] Their daughter, Ashley Biden,[29] is a social worker. She is married to physician Howard Krein.[72] Beau Biden became an Army Judge Advocate in Iraq and later Delaware Attorney General[73] before dying of brain cancer in 2015.[74][75] As of 2008[update], Hunter Biden was a Washington lobbyist and investment adviser.[76]
Teaching
From 1991 to 2008, as an adjunct professor, Biden co-taught a seminar on constitutional law at Widener University School of Law.[77][78] The seminar often had a waiting list. Biden sometimes flew back from overseas to teach the class.[79][80][81][82]

U.S. Senate (1973–2009)
Main article: US Senate career of Joe Biden
Senate activities
Biden with President Jimmy Carter, 1979
In January 1973, secretary of the Senate Francis R. Valeo swore Biden in at the Delaware Division of the Wilmington Medical Center.[83][55] Present were his sons Beau (whose leg was still in traction from the automobile accident) and Hunter and other family members.[83][55] At 30, he was the sixth-youngest senator in U.S. history.[84] To see his sons, Biden traveled by train between his Delaware home and D.C.[85]—74 minutes each way—and maintained this habit throughout his 36 years in the Senate.