Tom Hogan, 50, decided to leave HP. He served as EVP of Sales and Marketing for HP’s Enterprise Business group, with global responsibility for the sales and marketing of all products and solutions for the $57-billion-a-year business. Prior to this, Hogan turned around HP’s software business. Hogan also served as the CEO of Software maker, Vignette and was an executive at SAP. Jan Zadak, Managing Director for HP Europe, the Middle East and Africa, will assume Hogan’s role.