3M's presidents have included: Edgar B. Ober (1905–1929), McKnight (1929–1949), Richard P. Carlton (1949–1953), Herbert P. Buetow (1953–1963), Cross (1963–1966), Heltzer (1966–1970), and Herzog (1970–1975). In the late 1970s, the position was separated into roles for U.S. and international operations. The position overseeing domestic operations was first held by Lehr, followed by John Pitblado from 1979 to 1981, then Jacobson from 1984 to 1991. James A. Thwaits led international operations starting in 1979. Buckley and Thulin were president during 2005–2012, and 2012–2018, respectively.