1998-present  PROFESSOR OF GEOLOGY, Brigham Young University

1996-1998 ASSOCIATE PROFESSOR OF GEOLOGY, West Virginia University

1989-1995 ASSISTANT PROFESSOR OF GEOLOGY, West Virginia University

2010 VISITING PROFESSOR, National Cheng Kung University, Tainan, Taiwan, Arc-Continent Collision Processes 

1997 VISITING PROFESSOR, Universitas Pembangan Nasional, Yogyakarta, Indonesia, Natural Disaster Mitigation in Indonesia. 

1991-1995 GEOLOGIST, U.S. Geological Survey, Branch of Alaskan Geology (intermittent).

1986-2010 GEOLOGIC CONSULTANT, U.S. Geological Survey/ U.S. Bureau of Mines; Exxon-Mobil, Chevron-Texaco, Union Texas Petroleum, British Petroleum and ARCO (geologic evolution of Eastern Indonesia).

1988  Instructor, Sultan Qaboos University, Oman

1986-89: RESEARCH ASSISTANT, University of London (structural field studies of mountain building processes in the active Banda and Taiwan orogens, and Alaska, Oman, and Cyprus).

1985-86  Director of Field Geology Course in Alaska Range, Univ. of Alaska,

1983-86 RESEARCH ASSISTANT, Geophysical Institute, Univ. of Alaska (structure, thermochronolgy, and paleomagnetism of Yukon-Koyukuk Province, Alaska).

1983 GEOLOGIST, Alaska Division of Geological and Geophysical Surveys (field mapping in the Brooks Range and its metamorphic borderlands).

1982: GEOLOGIST INTERN, Unocal Oil Co., Ventura, CA (exploration of Ventura Basin, California)

>75 invited talks at Universities, international conferences, government institutes and Industry.

Several research and teaching awards

Several newspaper articles and television and radio interviews.