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L. Mark Walker

L. Mark Walker, a director in Crowe & Dunlevy’s Oklahoma City office, focuses his practice in the areas of energy, natural resources and environmental law. His practice includes litigation in both federal and state courts, as well as practicing before… Continue reading L. Mark Walker

Evan G.E. Vincent

Evan Vincent is a director in the firm’s Oklahoma City office. His practice involves a wide variety of complex and high stakes civil matters, and he regularly handles cases as lead counsel in the pretrial, trial and appellate stages. He… Continue reading Evan G.E. Vincent

David M. Sullivan

David Sullivan is a registered patent attorney and chair of the firm’s Intellectual Property and Technology group. David’s practice is primarily directed at obtaining and enforcing patent and trademark rights for his clients, who range from Fortune 500 companies to… Continue reading David M. Sullivan

Christopher M. Staine

Christopher Staine is a director in the firm’s Dallas office. He is an experienced litigator that represents individuals and companies in a wide range of commercial disputes in state, federal, and bankruptcy courts throughout the country. Christopher focuses his litigation… Continue reading Christopher M. Staine

Jay Shanker

Jay Shanker is a veteran entertainment industry attorney whose practice encompasses all aspects of entertainment and new media law. The Oklahoma native joined Crowe & Dunlevy in 2017 after practicing law in Los Angeles from 1981 until 2005, with offices… Continue reading Jay Shanker

Donald K. Shandy

Don Shandy is a director in the firm’s Oklahoma City office. Throughout his career, Don’s legal practice has been focused on the environmental and energy areas. Don has worked on projects in 41 states and five foreign countries. He has… Continue reading Donald K. Shandy