Tim's practice focuses primarily on state and local tax matters. He counsels business clients on New Mexico tax planning, and represents them in administrative and litigation matters, involving gross receipts tax, compensating tax, severance taxes, tobacco tax, fuel taxes, property tax, corporate income tax, and allocation/apportionment issues for multistate corporations. He also assists clients with drafting tax legislation and administrative issues.

A substantial part of Tim's tax practice is devoted to assisting businesses seeking to expand or relocate in New Mexico to understand application of New Mexico’s tax system to their business and transactions, as well as how to take full advantage of tax incentives in New Mexico and other states. In that capacity, Tim has assisted numerous renewable energy project developers with state and local tax issues peculiar to their businesses.

Tim also has experience with Indian law, including tax issues, as well as land use and general commercial litigation.

Tim is a frequent lecturer on New Mexico's tax system and tax issues. He has spoken before the Council on State Taxation (COST), the New Mexico State Bar, Georgetown University State and Local Tax Symposium and the Institute for Professionals in Taxation (IPT), and presented seminars for Lorman Educational Services as well as accounting and civic organizations. He also authors the annual New Mexico chapters for the American Bar Association Property Tax Deskbook and Sales and Use Tax Deskbook, as well as serving as Deputy Editor in Chief for the Property Tax Deskbook.

Prior to joining the firm, Tim was a shareholder and director at Modrall, Sperling, Roehl, Harris & Sisk in Albuquerque.