Employees at Cloud Peak Energy rank Colin Marshall in the Bottom 10% of similar sized companies. Comparatively, employees at NiSource rank Joseph Hamrock in the Top 40% of similar sized companies. Employees rate their CEO differently based on the frequency of interaction, ability to affect company culture, and drive measurable results.

Colin Marshall

CEO of Cloud Peak Energy

BIO: Mr. Colin Marshall serves as the Chief Executive Officer and President of Cloud Peak Energy Logistics LLC, Arrowhead I LLC, Arrowhead III LLC and Cloud Peak Energy Resources LLC. Mr. Marshall has been the Chief Executive Officer and President of Cloud Peak Energy Inc. (alternate name Cloud Peak Coal) since July 2008 and is its Chief Operating Officer since January 2018. He served as the President and Chief Executive Officer of Rio Tinto Energy America Inc. from June 2006 to November 2009. He had been responsible for all North American energy-related business of Rio Tinto Energy, the global energy company of Rio Tinto plc in London. He served as the General Manager of Pilbara Iron's west Pilbara iron ore operations from March 2004 to May 2006. He was located in Tom Price, West Australia, where he managed four iron ore mines. He began his career with Rio Tinto group in 1987 as a Graduate Trainee. He worked for Rio Tinto plc in London as an Analyst in the Business Evaluation Department from 1991 to 1996. From 1996 to 2000, he served as Finance Director of Rio Tinto Pacific Coal business. Since 2000, he served as General Manager of Rio Tinto Energy America's Cordero Rojo Mine in Wyoming from 2000 to March 2004. From August 2000 to June 2001, he served as Operations Manager of RTEA's Cordero Rojo mine. He worked for Rio Tinto plc in London as an Analyst in the Business Evaluation Department from 1992 to 1996. He has been a Director of Cloud Peak Energy Inc. and Cloud Peak Energy Resources LLC since July 2008. He serves as a Director of Rio Tinto Energy America Inc. He holds both a Bachelor's and Master's degrees in Mechanical Engineering from Brunel University and an MBA from London Business School.

Joseph Hamrock

CEO of NiSource

BIO: Mr. Joseph Hamrock, also known as Joe, has been the Chief Executive Officer and President of NiSource Inc. since July 1, 2015. Mr. Hamrock served as an Executive Vice President and Group Chief Executive Officer of Gas Distribution Segment at NiSource Inc. from May 2012 to June 02, 2015. Mr. Hamrock served as the President and Chief Operating Officer of Columbus Southern Power Company since 2008 until March 2012. He served as the President and Chief Operating Officer of Ohio Power Company since 2008. Mr. Hamrock served as Senior Vice President and Chief Information Officer of American Electric Power Co. Inc., from July 2, 2003 to January 2008. He served as Senior Vice President of General Services at American Electric Power Co. Inc., since 2002. Mr. Hamrock joined American Electric Power Co. in 1986 at Steubenville, Ohio and served as its Electrical Engineer in transmission and distribution planning. He served as Supervisor in Commercial Marketing and Customer Services of American Electric Power Co. Inc. and served as its Director of strategic development and Executive Assistant to E. Linn Draper. Mr. Hamrock has been a Director of NiSource Inc. since June 02, 2015. Mr. Hamrock received Bachelor's Degree in Electrical Engineering from Youngstown (Ohio) State University and Master's Degree in Business Administration from Massachusetts Institute of Technology, where he was a Sloan Fellow.