David S. O'Leary

Mari Perczak is the co-practice group leader of the Construction Defects department at Burg Simpson. She and her department have achieved Tier 1 status by US News and World Report, which is the highest-ranking available. Ms. Perczak has more than thirty years of experience as a Colorado trial lawyer and has successfully handled many large construction defect cases for Colorado homeowners and homeowner associations. In 2020, Ms. Perczak was lead trial counsel in a lengthy arbitration where she...

Jocelyn has extensive experience representing companies and individuals with their immigration and global mobility needs. Her practice focuses on providing efficient and effective immigration and global mobility solutions to companies throughout the United States. She represents a broad variety of companies and individuals with all types of business-related nonimmigrant petitions (especially H, L, E, O, P and TN petitions), applications for labor certification, employment-based immigrant peti...

Langdon’s practice concentrates on complex domestic relations matters, inclusive of dissolution of marriage, legal separations, custody disputes, child support modifications, parenting time issues and post-decree matters. He is admitted to the Colorado and U.S. District Courts, the U.S. Court of Appeals and the U.S. Supreme Court.

Tom Bieging is of counsel with the firm. He focuses his practice in the areas of banking and commercial litigation. Mr. Bieging’s financial institutions practice includes holding company and change of control applications, loan documentation, regulatory compliance advice, loan work outs, board representation, and the sale, acquisition, and merger of banks and bank holding companies. Mr. Bieging has litigated with government agencies on financial institution policy matters with national ...

Ryan Christ is a lawyer recognized by Best Lawyers in the practice area of Real Estate Law. Ryan practices law in Denver, Colorado Best Lawyers has recognized Ryan Christ since 2027. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Ryan Christ is held by other lawyers.

Concentrates on oil and gas, environmental and land use law. Involved in many of the major disputes facing the energy industry in Colorado. Mark Mathews has successfully represented oil and gas and mining clients and real estate development companies in litigation and regulatory rulemakings concerning oil and gas preemption and royalty issues, hazardous waste contamination, enforcement of oil and gas regulations, zoning and development disputes and land use permitting issues. Mark is outside ...

Aaron Evans is a lawyer recognized by Best Lawyers in the practice areas of Litigation - Trusts and Estates and Trusts and Estates. Aaron practices law in Denver, Colorado Best Lawyers has recognized Aaron Evans since 2024. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Aaron Evans is held by other lawyers.

For twenty years, Carrie Bernstein has used her experience and expertise in the areas of eminent domain law and real estate litigation to advocate for her clients. Without excess drama, Carrie has a no-nonsense approach to helping her clients that people appreciate. At Alderman Bernstein, Carrie represents private landowners, quasi-municipal corporations, and public entities in eminent domain in both litigation and appeals. She has been designated as one of the Best Lawyers in America for Emi...

Matthew Gizzi is a lawyer recognized by Best Lawyers in the practice area of Workers' Compensation Law - Claimants. Matthew practices law in Aurora, Colorado Best Lawyers has recognized Matthew Gizzi since 2024. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Matthew Gizzi is held by other lawyers.

More than two decades facilitating successful business transactions. Respected dealmaker in health care industry. Dedicated firm and community leader. Mike King guides clients through their organization’s most pivotal moments. Handling the full range of public and private transactions from asset acquisitions and sales to joint ventures, securing financing to fund growth, mergers and acquisitions, and leveraged buy outs, Mike provides sophisticated counsel to close deals. Rounding out hi...