The Greenbrier Companies, Inc. announced that retirement of Mark Rittenbaum. Brian Comstock has been appointed to Chief Commercial & Leasing Officer by Greenbrier's Board of Directors, effective immediately. After more than 35 years of service to Greenbrier, Rittenbaum will retire in August 2022. Remaining an Executive Vice President and Senior Advisor to the Chairman, he will aid the Commercial & Leasing group in its transition to new leadership. He will continue to advance the Commercial & Leasing group's work to strengthen Greenbrier's Leasing model, with the aim of broader customer reach and enhanced shareholder value. Rittenbaum continues to report to William A. Furman, Chairman and CEO, and will take on special projects and other duties as assigned. In his new position, Comstock executes Greenbrier's go-to-market strategy in North America and South America. He also continues to direct all Greenbrier Commercial & Leasing strategies in the Americas. Comstock began his career in the railroad industry in 1980. Prior to joining Greenbrier in 1998, he served in commercial and operational roles at PLM Leasing, Transco Railway Products, Inc. and Trinity Industries. At Greenbrier, Comstock steadily advanced from a Commercial Team member, to Vice President, Sales, to Vice President, Sales and Marketing. In April 2018, Comstock was appointed Executive Vice President, Sales and Marketing, North and South America. He serves on the boards of Greenbrier's manufacturing joint ventures in Mexico and Brazil and interacts closely, on an advisory basis, with Greenbrier teams in Europe and the Gulf Cooperation Council nations.