The New York Stock Exchange appointed Carly Fiorina, Hewlett-Packard's ( HPQ) chairwoman and chief executive, and Jeffrey Greenberg, Marsh & McClennan's ( MMC) chairman and chief executive, to a new advisory board.

The 19-member panel, which includes executives from Big Board-listed companies, investment banks and pension funds, meets six times a year and advises the NYSE board of directors on market structure issues.

The new board was created last year as part of reform package for the NYSE's corporate governance. The measures were instituted in the aftermath of the scandal over the $140 million pay package awarded to Richard Grasso, the NYSE's former chairman and chief executive.

Greenberg knows something about scandal himself. Marsh & McClennan is the parent of Putnam Investments, a mutual fund company that has been sanctioned by regulators over its role in the mutual fund trading scandal.

With the addition of Greenberg and Fiorina, the advisory board now has four representatives from listed companies. The NYSE earlier named Louis Camilleri, chairman and CEO of Altria Group ( MO), and Mel Karmazin, president and chief operating officer of Viacom ( VIA), to the board.

The advisory board of executives meets six times a year. Its members are appointed annually by the NYSE board of directors.