LISLE, IL-Navistar announced it is restructuring its senior leadership team by giving three executives additional responsibilities.

The company also announced that Jack Allen, 56, the company’s executive vice president and chief operating officer since April 2013, is retiring after more than 33 years of service to the company.

“Today is a new beginning for Navistar,” said Troy Clarke, Navistar president and CEO. “We are introducing a new leadership team and organization structure that will guide us into the future and enable us to accelerate our performance now that our turnaround is behind us.”

“We’re a different company-a better performing company-than we were two years ago,” Clarke said. “We’ve streamlined the organization, focused our efforts on functional excellence and implemented lean operating principles throughout the company. This new structure will build on those efforts and allow us to grow profitable market share as we more effectively plan, design, build and sell our vehicles, parts and services and deliver industry-leading uptime for our customers.”

Bill Kozek

Bill Kozek, 52, president of North America Truck and Parts, has been promoted to president, Truck and Parts, and is adding global/export truck and parts sales, product planning and Navistar Defense to his current responsibilities.

Kozek joined Navistar in May 2013 after more than 26 years with PACCAR, where he most recently served as vice president and general manager of the Peterbilt division, responsible for all aspects of Peterbilt’s U.S. and Canadian operations.

Persio Lisboa

Persio Lisboa, 49, senior vice president and chief procurement officer, has been promoted to president, Operations, and is now also responsible for product

Lisboa joined the company in 1988 in the marketing area of Maxion International Motores Brasil. Prior to roles in procurement, Lisboa served as vice president and general manager in the company’s engine group, as well as several other leadership positions in South America such as president of the Argentina subsidiary and vice president of sales and marketing for Navistar’s engine group in Brazil.

Walter Borst

Walter Borst, 52, executive vice president and chief financial officer, is adding business development, mergers and acquisitions, and corporate strategic planning responsibilities to his portfolio.

Borst joined Navistar in August 2013 from General Motors Company, where he most recently was the chairman, chief executive officer and president of GM Asset Management, responsible for managing approximately $85 billion in assets. Previously, Borst was vice president and treasurer at GM from 2003 to 2010. He also served as CFO of Adam Opel AG in Ruesselsheim, Germany from 2000-2002. Prior to that time, he served in various treasury, controller, and financial operating capacities at GM.

These leadership and structural changes are effective immediately.