WILLIAM M. GEIGER, B.S., is Senior Partner of CONSCI, LTD, an independent service provider. He is responsible for implementation of analytical technology as it relates to gas analysis, including method development, turn-key instrumentation for customers, and consultation. Mr. Geiger has authored or coauthored numerous papers and presentations relating to trace gas measurement techniques.

MARK W. RAYNOR, PhD, is Senior R&D Director at Matheson's Advanced Technology Center. He is responsible for the development of new gas products and precursors for the electronics industry, with an emphasis on the development of instrumental techniques for gas analysis as well as the synthesis, scale-up and purification of specialty gases. Dr Raynor has authored or coauthored more than sixty papers in analytical chemistry.