Inter­view of nona­ge­nar­i­an Dr. Hal­dor Top­søe, founder of Hal­dor Top­søe A/S Cat­a­lyst Com­pa­ny, by Pro­fes­sor Burt Davis dur­ing the June 2005 NAM meet­ing in Philadel­phia, PA

 
Intro­duc­tion by John Stencel