John is founder and president of Mercator Energy LLC, a natural gas services, brokerage and energy market analysis company. Mercator assists both producers and end users throughout the United States in selling and sourcing natural gas supplies. Mercator manages more than 1.2 BCF per day of natural gas in seven states. Mercator also conducts specific research projects for client groups exploring the impact of industry trends on various regional markets. Mercator’s analysis on “Poverty and Fracking” was featured in a Wall Street Journal editorial and on Fox News.

During his career, Harpole has provided strategic advice and counseling to independent oil and gas producers, power producers, major gas and electric utilities, hedge funds and energy traders, retail and wholesale energy marketers, equipment vendors and large energy users typically at the CEO level. Harpole has travelled to China on two occasions to instruct employees of PetroChina and members of the Central Parties Pricing Committee on the regulatory and marketing history of natural gas in the United States. It marked the first time a foreigner was allowed to teach a course to PetroChina marketing employees.

Harpole is a Board Member of the Colorado Oil and Gas Association, the Leadership Program of the Rockies, the Global Institute of Church Management Pontifical University of the Holy Cross in Rome, Italy and the Unreported Story Society. John currently serves on the Board of Directors of Benedictine College. John is a former 15-year Board Member of Energy Outreach Colorado.

Harpole has also been named to the Denver Business Journal's Who's Who in Energy for years 2014-2019.

John's hobbies include reading, fly fishing, bass fishing and collecting antique maps.