AlphaStaff, a professional employer organization, appointed Samuel Rossa as executive vice president, operations and analytics. Rossa has more than 26 years of experience as CEO and chief operating officer with extensive background in human capital services. Rossa previously served as managing director for Experis and Black Rooster Consulting.

CTPartners Executive Search Inc. (AMEX: CTP), an executive search firm, named Timothy Boerkoel as managing partner of its global consumer and retail practice. Boerkoel has more than 20 years of experience in executive search, having most recently been a partner for the retail, apparel and luxury practice at Heidrick & Struggles.

Heidrick & Struggles International Inc. (NASD: HSII), an executive search firm, appointed Anne Lim O’Brien to vice chairman within its global CEO and board of directors practice. O’Brien began her consulting career in Singapore with Price Waterhouse and has conducted executive search assignments for a range of Fortune 500 corporations.