shortly after Johnston's birth, where he grew to adulthood. Johnston grew up with one sister. His father worked as an engineer at a local company and his mother as a newspaper editor. Johnston often took photographs for his mother's newspaper and contributed articles to his school's newspaper. He never married. After graduating from Harold L. Richards High School in Oak Lawn, Johnston attended the University of Illinois at Urbana-Champaign. He planned to study journalism, but became intrigued by an introductory geology class, and changed his major. His first geologic project was a study of the Precambrian rock that forms Michigan's Upper Peninsula. There he investigated the remains of an ancient volcano: a suite of metamorphosed basalts, a gabbroic sill, and volcanic roots in the form of a dioritic and gabbroic intrusion. The experience planted the seed of Johnston's passion for volcanoes. After working hard to learn the subject, he graduated with "Highest Honors and Distinction" in 1971. Johnston spent the summer after college in the San Juan volcanic field of Colorado working with volcanologist Pete Lipman in his study of two extinct calderas. This work became the inspiration for the first phase of his graduate work at the University of Washington in Seattle, in which he focused on the Oligocene Cimarron andesitic volcanic complex in the western San Juans. Johnston's reconstruction of the eruptive history of the extinct volcanoes prepared him to study active volcanoes. Johnston's first experience with active volcanoes was a geophysical survey of Mount Augustine in Alaska in 1975. When Mount Augustine erupted in 1976, Johnston raced back to Alaska, shunting his former work on the Cimmaron Volcano into a master's thesis, and making Mount Augustine the focus of his Ph.D. work. He graduated in 1978 with his Ph.D., having shown that (1) the emplacement mechanism of the pyroclastic flows had changed over time, as they became less pumaceous, (2) the magmas contained high quantities of volatile water, chlorine, and sulfur, and (3) underground mixing of the felsic (silicic) magmas with less-viscous mafic (basaltic) magmas could have triggered eruptions. Mount Augustine was also the site of an early near-disaster for Johnston, when he became trapped on Augustine Island as the volcano was building toward another eruption. During the summers of 1978 and 1979, Johnston led studies of the ash-flow sheet emplaced in the 1912 eruption of Mount Katmai in the Valley of Ten Thousand Smokes. The gas