Rob McCallum's practice emphasizes the resolution of civil and criminal tax matters before the Internal Revenue Service and the Washington State Department of Revenue. He also represents clients in other federal and state criminal matters.

Prior to entering private practice, Mr. McCallum was a federal prosecutor with the Criminal Tax Section of the United States Department of Justice and an Attorney-Advisor with the United States Tax Court in Washington, D.C. While at the Department of Justice, he represented the Internal Revenue Service in grand jury investigations and criminal trials in federal district court.

Mr. McCallum is an adjunct professor at Seattle University School of Law and Golden Gate University's Graduate Tax Program in Seattle, where he teaches several courses, including tax practice and procedure. He has received the Outstanding Faculty Member Award and Distinguished Teaching Award from Golden Gate University.