• Walter Ogier will join Arbios Systems (Los Angeles) as president and CEO, effective Nov. 7. Ogier succeeds Amy Factor, who had been serving as the company’s interim CEO since April. Prior to joining Arbios, Ogier was president and CEO of Genetix Pharmaceuticals. Arbios is a cell-based therapy company developing liver-assist devices and new technologies useful in the diagnosis and treatment of liver failure.

• Timothy Martin has been named president and CEO of Cardiovascular Services of America (Brentwood, Tennessee). Martin, currently executive vice president and COO with Renal Care Group, a specialized dialysis services company, will assume his new position upon the completion of the acquisition of Renal Care Group by Fresenius Medical Care, which is expected to close in 4Q05. Cardiovascular Services of America is a developer and operator of outpatient cath labs and computed tomography angiography suites in partnership with cardiology groups.

• C. Christian Winkle will join MedQuest (Alpharetta, Georgia) as CEO. Winkle served as president and CEO of Mariner Health Care from 2000 through the successful merger of Mariner and National Senior Care in December 2004. From then until July, Winkle served as president and CEO of SavaSeniorCare, a newly formed company that leased certain of the former Mariner facilities. MedQuest operates a network of 93 independent, fixed-site, outpatient diagnostic imaging centers in 13 states.

• Dr. Barney Saunders has been named chief operating officer of Microchip Biotechnologies (Dublin, California). Most recently Saunders mostly recently was with Agilent Technologies’ Life Sciences and Chemical Analysis division, as general manager and vice president, bioresearch solutions, and senior director, science and technology. Microchip Biotechnologies is an early-stage developer of advanced nanofluidic sample preparation and analytical instruments for the genomics and biodefense markets.

• Michael McGarrity has joined nanotechnology-based molecular diagnostics firm Nanosphere (Northbrook, Illinois) as chief marketing officer. He joins Nano-sphere after 13 years with Stryker, where his positions including vice president of marketing for Stryker Instruments.

• Larry Ellberger has been namex interim CEO of PDI (Saddle River, New Jersey), succeeding Charles Saldarini, who has resigned as the company’s vice chairman and CEO. Ellberger is currently executive vice president and chief administrative officer of the company. PDI is a sales and marketing services provider to the biopharmaceutical and medical device/diagnostics industries.

• Recom Managed Systems (Greenville, South Carolina), which is focused on the monitoring and detection of disease through continuous biomedical signal monitoring, has named Susan Keitt director of Recom’s Cardiac Services Division and Alaine Sosebee clinical manager of Cardiac Services. Keitt most recently was national director of Holter services for Lifewatch, a division of Card Guard. Sosebee formerly was national manager of Holter services for Lifewatch. These appointments complete the division’s management team and allow Recom to immediately implement its plan for a full-service ambulatory monitoring center, which will begin operations upon introduction of the company’s Model 100 Heart Monitor in settings outside the physician’s office.

• Doug Rau has been named vice president of human resources for Sigma-Aldrich (St. Louis), effective Dec. 5. He most recently served three years as vice president, human resources at Kellwood. Sigma-Aldrich’s biochemical and organic chemical products and kits are used in scientific and genomic research, biotechnology, pharmaceutical development, the diagnosis of disease and as key components in pharmaceutical and other high-technology manufacturing.

• Patrick Edgerton has joined Zonda (Temecula, California) as vice president of European/U.S. operations. Edgerton most recently served as CEO of Sun Drug. Zonda specializes in test products that serve the medical diagnostic, bacterial food testing and environmental surfaces testing markets, and is a portfolio investment of CLX Investment Co.