Mark's practice emphasizes federal, state and local taxation and the relationship and impact those areas of taxation have on both business transactions and personal investments. He also engages in a general business practice, with a particular emphasis on partnerships and limited liability companies. Additionally, Mark represents clients in tax controversies before the Tax Court, IRS and similar state and local courts and agencies. 

A partner at Tonkon Torp since 1990, Mark has served as a member of the Managing Board, Chair of the Business Department, Chair of the Tax Practice Group, and in a number of other management positions.

Mark co-authored the Section on Involuntary Conversions for the Bender Federal Tax Service and the chapter on Subchapter S Taxation for Advising Oregon Businesses. He was a featured speaker in the Oregon State Bar sponsored CLE presentation on Oregon's New Revised Partnership Act and he speaks from time to time on various tax topics.

Since 2006, Mark has been recognized as a leader in tax law by The Best Lawyers in America®. He was selected as Portland's Lawyer of the Year in Tax Law for 2013 by Best Lawyers in America.

Oregon State Bar

Tax Section

Executive Committee

Committee on the Revised Uniform Partnership Act

St. Thomas More Parish

Finance Council

Portland's Reclaiming Our Streets Implementation Team

Former Member

City of Portland

Photo-Radar Oversight Committee

South Park Blocks Association

Transportation Committee

Southwest Hills Residential League