Michael Feeney Callan Harris. His biography of Robert Redford ("Robert Redford: The Biography"; Knopf, 2011) was chosen by the "Sunday Times" as one of its recommended Best Books of 2011. In 2013, he published his second volume of poetry, "An Argument for Sin". Callan was born to Michael Callan, an engineer, and Margaret (née Feeney) in Drumcondra, Dublin. After living in London, Callan resettled in Dublin with his wife Ree and their two children. He frequently spends time at Châteauneuf de Grasse, where he paints and sculpts. Callan started writing in his teens, publishing poetry in David Marcus' "New Irish Writing". His first
Curtis Callan students include Philip Argyres, Vijay Balasubramanian, William E. Caswell, Peter Woit, Igor Klebanov, Juan Maldacena, Larus Thorlacius, Alberto Güijosa and Justin B. Kinney. Callan is best known for his work on broken scale invariance (Callan–Symanzik equation) and has also made leading contributions to quantum field theory and string theory in the areas of dyon-fermion dynamics, string solitons and black holes. Callan has been a member of the JASON defense advisory group since 1968, and was chair of the group from 1990 to 1995. He served as president of the American Physical Society in 2010. Curtis Callan Curtis Gove Callan Jr.