RICHARD S. CARDEN has taught drilling, horizontal drilling and underbalanced drilling seminars in the United States and internationally for more than 20 years. He has authored numerous technical papers on directional drilling and underbalanced drilling. He was a contributing author to the Underbalanced Drilling Manual published by GRI. He worked for Grace, Shursen, Moore and Associates (GSM) as a drilling completion consultant both domestically and overseas. While at GSM he was a wellsite consultant drilling and completing wells in the field; including: geothermal wells, deep/high-pressure gas wells, air drilled wells, directional wells, and horizontal wells. He also worked as a Drilling and Production Engineer for Marathon Oil Company in the Rocky Mountain region. He earned a B.S. degree in Petroleum Engineering from Montana College of Mineral Science and Technology in 1977.