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Union Pacific Railroad yesterday announced executive appointments for Jon Panzer, Jennifer Hamann and Gary Grosz. The appointments take effect April 1, according to a UP press release.Currently vice president and treasurer, Panzer will become senior vice president, technology and strategic planning. A 23-year UP veteran, he succeeds Lynden Tennison, who announced Jan. 29 that he will retire March 31.During his career at UP, Panzer has held leadership positions in planning and analysis, finance, marketing and sales. In his new role, he will report to Chief Operating Officer Jim Vena.Currently VP of planning and analysis, Hamann will add responsibility for the investor relations and treasury functions. She's been with UP for 27 years and has held leadership positions in investor relations, marketing and sales. In addition, Hamann formerly served as general auditor. She will report to Executive VP and Chief Financial Officer Rob Knight.Grosz, assistant VP of corporate finance, will succeed Panzer while retaining his current responsibilities. He has been with UP for 37 years, all in the Class I's finance department. In his new role, Grosz will report to Hamann.