2022 - present    Editor, History Section, Wilderness and Environmental Medicine Journal

2021 - present    Board Member, Wilderness and Environmental Medicine Journal

2017- 2020      Affiliate Faculty, Clinical Sciences, Veterinary Teaching Hospital, Colorado State University, Fort Collins, CO

2012 - 2014     Consultant, Research Center for High Altitude Medicine, Qinghai University, Xining, China

2011 – 2013     Academic Visitor, Department of Anatomy, Physiology and Genetics, Oxford University, Oxford, UK 

2008 – 2009    Associate Professor, Department of Anesthesiology, University of Colorado Health Sciences Center, Denver CO

2007 – 2015   Consultant, Institute of Veterinary Physiology, University of Zürich, Zürich, Switzerland

2006 – 2011    Consultant, Department of Anatomy, Cambridge University, Cambridge, UK

2006 – 2008    Affiliate Faculty, Department of Health and Exercise Sciences, Colorado State University, Fort Collins CO

2002 - 2008     Assistant Professor, Department of Anesthesiology, University of Colorado Health Sciences Center, Denver CO

1996 - 2007     Affiliate Faculty, Department of Physiology, Colorado State University, Fort Collins CO

1996 - 2002     Instructor, Department of Extended Studies, University of Colorado, Denver  CO

1996 - 2002     Instructor, Department of Anesthesiology, University of Colorado Health Sciences Center, Denver CO

1995 - 2002     Consultant, Department of Extended Studies, University of Colorado,     Denver CO

1995 - 1997     Adjunct Faculty, University of Colorado, Biology Department, Denver CO

1994 - 1995     Post-Doctoral Fellow, Dept. Anatomy and Neurobiology, Colorado State University, Fort Collins, CO

1994 - 1995     Adjunct Faculty, Front Range Community College, Fort Collins CO

1993 - 1994     Research Assistant, University of Colorado Health Sciences Center, Pulmonary and Critical Care, Denver CO

1991 - 1992     Graduate Teaching Assistant, Colorado State University, Fort Collins CO

1990 - 1991     Graduate Research Assistant, Colorado State University, Fort Collins CO

1988 - 1989     Research Assistant, University of Colorado, Institute of Arctic and Alpine Research, Boulder CO