Agilent Chairman, president and CEO Ned Barnholt will retire at the end of next month, the Palo Alto, Calif.-based firm announced last week.

Barnholt, who has served as CEO for the past six years, will be succeeded by William Sullivan, who currently serves as executive vice president and COO. Sullivan also oversees Agilent’s largest business, the Electronic Products and Solutions Group.

James Cullen, who has served on Agilent’s board of directors since 2000, will take over as non-executive chairman upon Barnholt’s departure.