Mark Carhart and Raymond Iwanowski, co-heads of Goldman Sachs Group Inc.'s quantitative-investment group and Global Alpha hedge fund, are retiring, as is research co-head Giorgio De Santis.

Carhart and Iwanowski (pictured) will be replaced by Katinka Domotorffy, who was head of strategy at the quantitative group and will become its chief investment officer. Co-chief investment officers Kent Daniel, Bill Fallon and Robert Jones will assist her.

Jones will remain co-CIO of the equity team within the group, while Fallon will oversee the quantitative group's fixed-income and macro strategies.

Ulrich Körner was named chief operating officer of UBS and a member of its executive board. UBS also integrated its infrastructure and information technology, human resources, procurement, real estate and facility management areas into a corporate center, and will centralize the management of itsfinance, risk, legal and compliance areas. Körner also becomes CEO of the corporate center.

Körner had been with Credit Suisse Group since 1998. Most recently, he was CEO of the Switzerland region. Current COO of the corporate center, Walter Stuerzinger, will leave the group's executive board.

In other recent UBS moves, after one year in the position, Peter Kurer, chairman of UBS, said he will not stand for re-election on April 15. UBS nominated Kaspar Villiger as Kurer's replacement. Villiger was a member of the Swiss Federal Council as defense minister from 1989 to 1995 and finance minister from 1995 to 2003. He was president of the Swiss Confederation in 1995 and 2002. Villiger retired from politics in 2003, joining the boards of Swiss Reinsurance Co., Nestlé SA and newspaper Neue Zürcher Zeitung. He will resign from those boards.

Kurer has been group general counsel since 2001, when he joined UBS, and on the executive board since 2002.

UBS also said Ernesto Bertarelli, Gabrielle Kaufmann-Kohler and Joerg Wolle will not stand for reelection at the firm's April 15 annual meeting. Michel Demaré, Ann Godbehere and Axel Lehmann are candidates for the board.

In February, former Credit Suisse CEO Oswald Grübel, 65, came out of retirement to lead UBS, which announced that CEO Marcel Rohner would leave the bank. Grübel was the architect behind Credit Suisse's turnaround, for which he was nicknamed "St. Ossi."

Citigroup Inc. named Joseph Sauvage and Nick Mckee as co-heads of North American power and utilities banking. They report to Andrew Safran and Peter Tague, co-heads, North American energy, power and chemicals. Sauvage will continue as vice chairman of the investment banking group. Mckee ran the corporate banking operations for Citi's U.S. power group.

Rockefeller & Co. hired G. Patrick Fox III as a senior investment adviser, reporting to managing director Elizabeth Munson. Previously, Fox was an account manager for BlackRock Inc., where he managed relationships with private banks, and was previously responsible for new business development and client service for high net worth individuals and families. Before BlackRock, Fox spent 13 years at J.P. Morgan Chase & Co., including as a client portfolio manager at J.P. Morgan Asset Management and as a portfolio manager at J.P. Morgan Private Bank.

Sandler O'Neill + Partners LP said Christopher Connors and Thomas Oh joined its fixed income group in New York. Connors is a managing director, fixed income sales. Oh is an associate director, fixed income trading.

Connors arrives from Banc of America Securities LLC, where he spent seven years running its ABS secondary desk in New York and London. In late 2008, he transitioned to institutional sales. Oh joins Sandler O'Neill after 10 years with Credit Suisse as a member of its structured products group.

Rochdale Securities LLC took on Sal Catrini to organize communication between traders and clients. Catrini worked at Bear Stearns Cos. for nine years before it was bought by J.P. Morgan Chase & Co.

Mary Joan Hoene, an investment management and securities lawyer, joined Sonnenschein Nath & Rosenthal LLP in New York as counsel in its corporate practice. As independent fund chief compliance officer at Bank of America Corp., she was responsible for establishing a compliance program for four fund families aggregating more than $200 billion in assets, following the bank's merger with FleetBoston Financial Corp. Before BofA, Hoene was a partner at Carter Ledyard & Millburn LLP.

In Los Angeles, Sonnenschein tapped Robert Loo as managing director for insurance regulation. Loo is a former chief financial analyst and division chief for the California Department of Insurance.

In Palo Alto, Calif., the firm welcomed Craig Menden as a partner in its venture technology group. The M&A veteran joins from Fenwick & West LLP. Also, nine lawyers became partners: Litigator David Alverson; Katherine Evans, insurance regulatory; Ramy Fayed and Elizabeth McCubrey, healthcare; corporate attorneys Nadim Kazi and Lance Formwalt; Jo Christine Reed, corporate reorganization and bankruptcy; Michael Zolandz, public law and policy strategies; and Shane McGee, Internet, communications and data protection.