Dr Stevenson is a serial entrepreneur, internationally recognized nuclear physicist, and inventor.  He is the former Group Leader of Isotope Production Head of Applied Technology at TRIUMF, and has organized/chaired numerous national and international conferences and scientific meetings related to isotopes.  Prior to Rheumco/R-NAV, Nigel was a founder/member of senior management of TcNET, LLC, Trace Life Sciences, Theragenics, and was the Chief Science Advisor of Advanced Medical Isotope Corp.  Nigel is the Founding Member of the World Council on Isotopes,and has held senior positions at the International Isotope Society.  Nigel has authored over 100 publications and patents.