Susan B. Esler, vice president, human resources and communications, adds functional responsibility for Communications and Corporate Affairs.
The above-named individuals, all of whom also hold the title of vice president of Ashland Inc., serve on the company's operating committee.
Larry L. Detjen, vice president, business integration, will continue to report to O'Brien with responsibilities for the rollout of the company's global SAP enterprise software system.
J. Marvin Quin, senior vice president and chief financial officer, will continue in his responsibilities for financial matters.
David L. Hausrath, senior vice president and general counsel, continues with responsibilities for all legal and corporate governance matters, as well as security and facilities management. He now has oversight of two additional groups: Environmental Health and Safety, and Government Relations.
O'Brien, Quin and Hausrath will comprise the company's executive committee and also serve on the operating committee.
O'Brien said, "This new organization is both highly focused and flexible in order to lead our 12,000 employees in rapidly responding to the challenges and opportunities of a global business environment."