The Hertz Corp. announced Oct. 29 that Gary Rappeport, the CEO of Donlen, a fleet leasing and management company acquired by Hertz in 2011, will be retiring at the end of 2012. Rappeport will be succeeded by Donlen's current President and COO, Tom Callahan, on Jan. 1, 2013.

Callahan will become vice president of Hertz and president of Donlen and will report directly to Hertz Chairman and CEO Mark P. Frissora.

Commenting on the Donlen leadership transition, Frissora said, "During the merger process last year, Gary indicated that he wanted to stay on board to ensure a smooth transition and to launch several new initiatives leveraging the respective strengths of Hertz and Donlen before retiring. Integration is 100% on track and already we have launched several new products and services made possible by our merger. Gary served Donlen, a highly successful company his father started in 1965, for 27 years, the last 15 as CEO, having developed a culture and management team that will take Donlen to new heights."

Frissora added, "Tom Callahan has been appointed Donlen's president after an extensive internal and external search conducted over the past several months. Tom has been with Donlen for seven years and has brought invaluable perspective and focus to Donlen. For example, he led efforts to implement new ways to measure and improve the company's approach to customer relationships, resulting in unprecedented year-over-year customer satisfaction and retention results. We look forward to the Donlen and Hertz teams implementing many of Tom's ideas to accelerate Donlen's growth."