Professional Memberships


Greg JessupGregory L. Jessup is CEO of Jessup, Harper, Dean, LLC. He is a Certified Professional Landman, licensed Real Estate Broker and is a member of numerous professional organizations. Greg has held many offices including Chairman of the Dallas Certified Professional Landman (CPL) Certification Committee, and Director, President of the Texas Energy Council also serving as an officer on the OCS Advisory Board. The Dallas Association of Petroleum Landmen honored him as the Landman of the Year for 2001. He has also been published in the national trade magazine, Landman.

Greg has now been in petroleum land management for almost 30 years, being actively involved in all phases of land operations, including negotiations, acquisitions, divestitures, marketing, maintenance, management, administration and offshore exploration. Greg began his full time oil and gas career as Land Manager for Kenneth C. English, P.E. in Dallas, Texas in 1982. He started Larson Energy, LLC in 2005 as a purchaser of Oil & Gas minerals in Oklahoma, eventually expanding the search area to 14 additional states. Additionally, since 2005, Jessup has sat on the Board of Directors of Drillsite Broadcast Company; DBC was founded to provide real-time 24/7 video broadcast and satellite communications for drilling operations. In 2006 Greg was Vice President of Land for Rooster Petroleum, LLC until its relocation from Irving to Houston, Texas. During his tenure he facilitated the $18.5MM acquisition of working interests in 17 blocks from PetroQuest Energy, Inc. [PQ - NYSE] in the Gulf of Mexico shelf. From 1997 to 2005, he was Vice President of Land for Magnum Hunter Production, Inc. and Gruy Petroleum Management Co. and Vice President of Land – Offshore with Magnum Hunter through its merger with Cimarex Energy Co. While at Magnum Hunter Greg assisted in the purchase of onshore and offshore properties valued in excess of $500,000,000.

Greg graduated in 1975 from Texas Tech University with a Bachelor of Administration degree in Management and attended both Tulsa University and Texas A&M University – Commerce (Oil & Gas Contracts and Real Estate respectively).

David HarperDavid Harper is CFO of Jessup Harper Dean LLC. Dave brings to the team a deeply well regarded and rare blend of expertise in both the Land and Auditing professions, especially where technicalities of Land, Gas and Marketing Agreements, JOA's, JVP's and Accounting converge to create complex nuances and where interpretation and clarity are needed for the bottom line dollars and cents.

Dave's formidable skill sets and industry credibility are rooted in the experience gained first hand working from an early age with his mother, an Independent Landman and Lease Broker in Eastern Oklahoma, who bought leases and minerals from her office located in the local bank.

Formal Credentials: Certified Public Accountant, Certified Professional Landman, B.S. 1981 Southwestern Oklahoma State Univ., 1986 B.Acc. University of Oklahoma , 1987 PLM University of Oklahoma . Member American Association of Professional Landmen, Dallas Association of Petroleum Landmen, COPAS (Council of Petroleum Accountants Societies) of Dallas Audit Committee Chairman. President, VLK Energy, LLC.