Blackstone announced that David Calhoun, the CEO of Nielsen Holdings N.V. will join Blackstone as a Senior Managing Director and Head of Private Equity Portfolio Operations. Dave will oversee a team of 21 professionals within the portfolio operations group which partners with portfolio company CEOs to drive key value creation initiatives throughout the companies. Dave will work within Blackstone's Private Equity business reporting to the Global Head of Private Equity, Joseph Baratta, and will also be involved with important strategic initiatives of the firm as a member of Blackstone's Management and Executive Committees.