John Zumberge has been vice president and cofounder of GeoMark Research in Houston since 1991. He was manager of geochemical and geological research for Cities Service - Occidental, general manager for Ruska Laboratories, and director of geochemical services for Core Laboratories. He has global experience in petroleum geochemistry, focusing on crude-oil biomarkers. He obtained a B.S. degree in chemistry from the University of Michigan and a Ph.D. in organic geochemistry from the University of Arizona.
GeoMark Research, Houston, TX