Mark Larrañaga is a member of the Washington, Oregon and California State Bar Association. From 2001 to 2006, Mark was the Director of Washington's first Death Penalty Resource Center, providing resources, consultation, and training to capital defense attorneys throughout Washington. Since 2006, he has been a partner at Walsh & Larrañaga in Seattle, Washington. Mark has been approved by the Washington State Supreme Court for appointment as lead counsel in death penalty trials, direct appeals, and post-conviction. He has also been deemed "learned counsel" under 18 U.S.C §3005 for appointment as lead counsel in federal death penalty cases. Mark has been appointed on capital trials, direct appeal and post-conviction cases in federal and state court in Washington, Oregon, Idaho, Colorado, Nevada and Alaska.
He has coordinated, participated in, and presented at national and international seminars on various aspects of capital punishment. He has also studied and written extensively on the administration of Washington's death penalty statute. He has been a member of the adjunct faculty since 2005.