A former prosecutor, Leahy has been active on criminal justice, human rights, privacy and environmental issues during his Senate career.
After the Sept. 11, 2001 terrorist attacks, Leahy led the Senate's negotiations with the Bush administration on the USA Patriot Act, the sweeping anti-terrorism bill responding to the attacks. He was a strong advocate in the international campaign against the production, export and use of anti-personnel land mines, writing the first law by any government to ban the export of the mines.
Leahy was a leader in the Judiciary Committee's investigation into the mass firings of U.S. attorneys during the Bush administration.
He is also an amateur photographer. A longtime "Batman" fan, Leahy and has made cameo appearances in "Batman" films.
Leahy and his wife Marcelle Pomerleau Leahy have a daughter and two sons. They live on a tree farm in Middlesex, Vt.