First licensed to practice law in Minnesota and Wisconsin in 1984, Diana Theos has practiced in both the private and public sector throughout a career in which she litigated civil and criminal matters, provided general business advice and helped organize business entities, assisted individuals with estate planning and handled probate proceedings. Diana also practiced in California, Washington and Colorado, in addition to Arizona. She has served as a prosecutor and a defender. She has more recently served as an Assistant Attorney General for the Arizona Department of Economic Security and the Division of Developmental Disabilities before starting her own practice in March, 2012.
Diana is a certified Child Welfare Law Specialist, 2014 (CWLS), Accredited by the State of Arizona Bar Association and National Association of Children's Counsel.
Diana is an active member of the Arizona Women Lawyers Association, working on the steering committee and various sub-committees.
Diana serves on the board of National Conference of Womens’ Bar Associations where she works to promote the advancement of women in the law.
Diana is participated in the Ladder Down program class for 2015.
Diana served as the former Chair of the Public Law Section of the Arizona State Bar.
Diana has served on a legislative advisory committee on the issues of foster care and juvenile law while she was an assistant district attorney in Wisconsin.
Diana has published numerous articles in "The Public Lawyer" newsletter of the Public Law Section.
Diana authored "Federal Firearms Legislation" in the Hamline Law Review.