• Mark Doda has been named president of DMS Imaging (Fargo, North Dakota), a member of the DMS Health Group. Doda has served as CFO for the DMS Health Group since 2001. DMS Imaging provides mobile, portable, interim and fixed-site diagnostic imaging services across the U.S.

• Thomas O'Connor has joined Exagen Diagnostics (Albuquerque, New Mexico) as vice president, sales, to be based in Exagen's Austin, Texas, office. Previously, O'Connor held positions as business development manager and North America sales manager for Beckman Coulter. Exagen develops genomic marker-based in vitro kits for predicting risk of recurrence or treatment response in oncology, infectious disease and other indications.

• MedicalCV (Minneapolis) said that John (Jack) Jungbauer will leave his position as vice president, finance and CFO upon the hiring of a successor. MedicalCV is a cardiovascular surgery device manufacturer, focused on products designed to improve patient outcomes through the early treatment of cardiovascular disorders and disease.

• Thomas Wilder will join PhotoThera (Carlsbad, California) as president and CEO on April 17. Wilder most recently was the president of ev3's Neurovascular Division. Jackson Streeter, MD, company founder and CEO, will continue to have a role as the company's chief scientific officer and chairman. PhotoThera employs therapeutic laser technology to treat unmet medical needs.

• Elizabeth Leininger, PhD, has been appointed vice president, regulatory affairs and quality assurance of StemCells (Palo Alto, California). Leininger most recently was vice president of regulatory affairs and quality at BAS Medical. StemCells is a clinical stage biotech focused on stem cell-based therapeutics to treat diseases of the nervous system, liver and pancreas.

• Viking Systems (San Diego), a manufacturer of 3-D laparoscopic vision systems for use in minimally invasive surgery, said that Tom Marsh, its president, CEO and a director, has elected to retire from his positions to pursue other opportunities. Marsh will continue as a company consultant. Viking anticipates that it will appoint Donald Tucker as the company's CEO, effective May 21. Tucker, a controlling shareholder, is retiring from his employment with an international consulting company in May. The company has appointed Nathan Harrison, MD, a director of the company and chairman of the compensation committee, to serve as interim CEO.