RVDO Mr. Herzfeld began his career in the oil and gas industry in 1971, and has been involved in many areas of the industry, in fields ranging from 500 to 18,000 feet in depth. He has been widely published and has presented at major industry seminars. Mr. Herzfeld is a member of the Society of Petroleum Engineers (SPE); American Association of Petroleum Geologists (AAPG); The Geological Society of America (GSA); and, The New York Academy of Sciences ((NYAS).