2009–Present, Associate Research Geologist
1992–2009, Assistant Research Geologist, Montana Bureau of Mines and Geology
1988–1990, Engineering Geologist, Montana Department of Transportation
1984–1987, Exploration Geologist, Freelance
M.S.—Geology, The University of Montana, Missoula
B.A.—Biology, Colorado College, Colorado Springs
—Western Montana field geology
—Structure and stratigraphy of the Belt Basin
—Metallic mineral deposits
Lonn, J., 1993, Phanerozoic mineralization in the Tobacco Root Mountains, Madison County, Montana. Extended Abstract. Northwest Geology 22:5–8.
Winston, D. and Lonn, J., 1988, Structural geology and Belt stratigraphy of the Tarkio area, Montana. Pp. 1–34 in R. M. Weidman, ed. Guidebook to the greater Missoula area: Tobacco Root Geological Society 13th Annual Field Conference
Lonn, J., 1984, Geometry of the western Montana thrust belt near Tarkio. Northwest Geology 13:25–31.