Marcus Thorsteinsson focuses his practice in the area of litigation and regulatory. He is a litigation attorney with experience in eDiscovery and concentrates on the implementation and execution of document review projects. Marcus has handled complex legal matters at all stages, prelitigation, litigation, and post litigation. His diverse background includes representation of clients in insurance bad faith, product liability, premises liability, medical malpractice, professional liability, motor vehicle accidents, and construction defect, in addition to juvenile law and criminal law. He also has experience handling matters before various licensing boards and in the preparation of Appeals and Writs to the Nevada Supreme Court and the Ninth Circuit Court of Appeals.

Born in Arlington, Texas, Marcus grew up in both Canada and the United States and is a dual citizen of those countries. In 2005, Arizona State University awarded him dual degrees-a Bachelor of Arts in Human Communication and a Bachelor of Science in Justice & Social Inquiry. Thereafter, Marcus attended California Western School of Law on an Academic Merit Scholarship and received his Juris Doctorate in 2008. Marcus became licensed to practice law in Nevada in 2008 (inactive as of 2017) and in Arizona in 2014.

While in law school, Marcus clerked at the Arizona Attorney General's Office, Criminal Division, where he worked on matters involving public corruption and white-collar crime and fraud. He also interned for the Bail Project under the supervision of the San Diego Public Defender's Office. The Bail Project provided Marcus the unique opportunity to interview felony arrestees in jail and represent actual clients in court as a Special Intern acting as a pre-arraignment representative for the Public Defender's Office. Going into the jail, Marcus contacted recent arrestees who have not made bail and conducted initial interviews to obtain information for bail representation, provided clients advice as to their rights and help clients solve problems arising from their incarceration. In court, as a Special Intern, Marcus represented clients at their arraignment and argued motions to reduce bail.