Dean focuses his energy legal practice in the areas of civil litigation arising from the exploration, production and transportation of oil and gas; title examination and curation; mergers and acquisitions; and transactional oil and gas legal work. Prior to joining Rosas, PLLC, Dean served as the managing partner of Trunnell & Sellers, P.C. which assisted energy clients, corporations and private individuals in business contractual law, taxation, debtor/creditor law, corporate financial restructuring, procurement and acquisition law, and other related areas of law. Dean has represented several Fortune 500 Companies before the Colorado Supreme Court Consolidation Panel, Colorado State District Courts, and the Colorado Board of Assessment Appeals – which collectively involve more than $100 million in gross tax assessments.