Prior to joining Penn State Law, Professor Erickson was a litigator and counselor in Denver, Colorado, specializing in medical malpractice defense and insurance defense matters. Professor Erickson helped launch Lee & Kinder, LLC in 2008, where he focused on administrative law with an emphasis on workers' compensation. Professor Erickson was active pro bono counsel with the Colorado Lawyers' Committee's Legal Night Task Force at Mi Casa Resource Center for Women and Centro San Juan Diego. Professor Erickson was a law clerk for The Hon. John P. Leopold (Ret.) of Colorado's 18th Judicial District.