MR. MARCUS A. (MARC) SUMMERS has over 30 years of oilfield experience and over 15 years of hands on training experience. He founded and ran PetrEX International, Inc., and is currently Discipline Manager of Well Construction/Drilling and a Sr. Instructor with PetroSkills. In 1980, he began working as a drilling engineer for Amoco for fifteen years in various locations around the world. His background includes operations, technical support, and drilling research functions. Since 1986 he has written a number of papers presented at SPE/IADC conferences and several articles published in Petroleum Engineer International, American Oil and Gas Reporter, etc. He received a BS in Petroleum Engineering from the University of Oklahoma and is a Registered Professional Engineer in Oklahoma.