HP today announced it has appointed David J. Shirk as senior vice president of Worldwide Marketing, HP Enterprise Business.

Deborah Nelson, who currently leads HP Enterprise Business Marketing, will become chief of staff for the Enterprise Sales, Marketing and Strategy unit at HP. Both changes are effective immediately.

Shirk and Nelson will report to Thomas E. Hogan, executive vice president, Enterprise Sales, Marketing and Strategy, HP.

Shirk will lead marketing for HP’s Enterprise Business, the approximately $54 billion unit of HP that includes the company’s industry-leading portfolio of servers, storage, networking, software and services.

Shirk joins HP from Siemens, where he served as executive vice president of Global Marketing and Communications. Shirk was responsible for public relations, digital marketing, industry and solution marketing, strategy and analyst relations, collateral, creative services, and campaigns and programs for Siemens’ hardware, software and services portfolio. Prior to Siemens, Shirk was executive vice president of Global Marketing at UGS Corp. He also held several leadership positions at Vignette, Novell and Oracle.

In her new role, Nelson will be responsible for driving the HP Enterprise Business sales and marketing agenda to establish HP as the partner of choice for enterprise solutions and the clear leader in client loyalty. Previously, Nelson held senior leadership positions for multiple HP business groups and client segments at both global and regional levels.

“David brings a long track record of thought leadership and results. His broad experience across hardware, software and services will be instrumental in aligning HP’s marketing with the continued expansion in our enterprise portfolio,” said Hogan. “Deborah has done an exemplary job the past five years leading a significant transformation in marketing. I look forward to her continued contributions as we partner to bring HP’s enterprise clients a new standard in service and value.”