Welborn Sullivan Meck & Tooley, P.C.

Welborn Sullivan Meck & Tooley, P.C. is a Rocky Mountain law firm with offices in Denver, Colorado, and Casper, Wyoming. Established in 1993, the firm advises public and private companies, entrepreneurs, landowners, government entities, and individuals on matters involving natural resources, business transactions, litigation, and land-based development. Its attorneys help clients address complex legal and commercial issues across Colorado, Wyoming, and other energy-producing regions while supporting practical business objectives and long-term project planning.

Welborn Sullivan Meck & Tooley, P.C. uses a collaborative approach that draws on legal, technical, regulatory, and industry experience. The firm’s attorneys include professionals with backgrounds as geologists, engineers, landmen, corporate counsel, and senior government officials. This range of experience helps the team evaluate legal risks within the broader operational and commercial context. The firm emphasizes careful analysis, efficient teamwork, and practical solutions when guiding clients through negotiations, regulatory proceedings, transactions, disputes, and major development projects.

Welborn Sullivan Meck & Tooley, P.C. provides services in oil and gas, mining, environmental law, public lands, mineral title examination, water law, and renewable energy. Its business practice covers corporate law, acquisitions and divestitures, securities, real estate, construction, taxation, estate planning, and trademark matters. The firm also handles trials, appeals, complex commercial litigation, eminent domain, mediation, and arbitration. Its attorneys represent clients before state and federal courts, regulatory agencies, commissions, and other decision-making bodies.

Welborn Sullivan Meck & Tooley, P.C. has earned national and regional recognition for its work in energy, natural resources, environmental law, business transactions, and litigation. In the 2026 Chambers USA guide, the Colorado office was ranked in Energy and Natural Resources and Environment, while the Wyoming office was ranked in Corporate and M&A and Real Estate. The firm combines industry knowledge, courtroom experience, and business-focused advice to help clients manage important legal challenges and pursue opportunities throughout the Rocky Mountain West.