Catherine counsels clients on energy-related environmental and administrative law at all levels of federal, state and local government, with particular emphasis on regulatory compliance, enforcement defense and administrative adjudication under the Pipeline Safety Act, Clean Water Act (including wetlands), the Oil Pollution Act and CERCLA. Catherine regularly advises clients with respect to natural resource damage assessment claims, spill and release reporting, Endangered Species Act matters, hazardous waste issues and issues arising under TSCA. She conducts large-scale confidential investigations and compliance audits to assist companies in identifying legal risks and preparing defenses. Catherine's clients include oil and natural gas pipelines, chemical companies and other major manufacturing concerns.

Catherine played a key role in the development of the firm's energy infrastructure (oil and gas pipelines) practice. She has served as a moderator, speaker and panelist at legal and industry conferences and seminars around the country, and is the author of numerous articles, book chapters and editorials on environmental, compliance and regulatory issues.