FMC Technologies, a $4.1 billion Houston-basedcompany that provides technology for the energy industry, namedHalet Murphy treasurer. He succeedsMaryann Seamann, who was promoted to CFO andsenior vice president. Murphy, 41, most recently was treasurer andvice president at Hawker Beechcraft. Earlier, he served asassistant treasurer at Novelis and director of financial riskmanagement at Lear, and worked in finance at Delphi and LTVCorp.

Cedar Fair, the $977 million amusement parkcompany, appointed Brian Witherow CFO andexecutive vice president. He replaces Peter Crage,who resigned in June. Witherow, 44, has been the Sandusky,Ohio-based company's corporate controller and vice president since2005. He was Cedar Fair's corporate treasurer from 2004 to 2005 andcorporate director of investor relations from 1995 to 2004. Priorto joining Cedar Fair, Witherow worked at Arthur Andersen.

Illumina, a $902 million San Diego-basedmanufacturer of genetic analysis tools, named MarcStapley CFO and senior vice president. He succeedsChristian Henry, who served as both CFO andgeneral manager of the company's genetic analysis business for twoyears, and will continue as general manager. Stapley, 42, mostrecently was senior vice president for global financial processesand systems at Pfizer. Earlier, he served as Americas CFO atAlcatel-Lucent, finance director and controller at Cadence DesignSystems and an auditor at Coopers & Lybrand.

Radiation Therapy Services, a $544 millionradiation treatment center operator in Fort Myers, Fla., appointedBryan Carey CFO and vice chairman. He replacesKerrin Gillespie, who resigned to accept a seniorfinance position at Health Management Associates. Carey, 50, joinsthe company from Vestar Capital Partners, where he was managingdirector. Previously, he was CFO, European managing director andexecutive vice president of Aearo Corp., director of strategicplanning at Cabot Corp. and a principal at Chemical VenturePartners.

Integrated Electrical Services, a $481 millionelectrical infrastructure services provider, named RobertLewey CFO and senior vice president. He succeedsTerry Freeman, who retired. Lewey, 50, has beentreasurer and vice president of finance for the Houston-basedcompany since May. Earlier, he served in other finance positionsfor IES, including vice president of tax, director of tax andtreasurer. Prior to joining IES, Lewey was vice president of taxfor Sulzer US Holdings and Metamor Worldwide.

U.S. Auto Parts Network, a $262 million onlineretailer of automotive parts in Carson, Calif., appointedDavid Robson CFO. He replaces TedSanders, who is leaving the company. Robson, 45, mostrecently was chief administrative officer and executive vicepresident at department store chain Mervyns. From 2001 to 2007, hewas senior vice president of finance and principal accountingofficer for music equipment retailer Guitar Center. Robson beganhis career with Deloitte & Touche.

Smart Balance, a $242 million health productcompany in Paramus, N.J., appointed ChristineSacco CFO, treasurer and executive vice president. Shereplaces Alan Gever, who is leaving to pursueother opportunities. Sacco, 36, has been Smart Balance's controllersince 2008 and principal accounting officer since 2011, a role shewill continue to hold on an interim basis. From 2002 to 2008, Saccowas treasurer, director of financial reporting and vice presidentat Alpharma, a subsidiary of Pfizer.