Union Pacific has promoted three employees.

Jennifer Hamann has been appointed general auditor. Hamann has 19 years of experience at Union Pacific, most recently serving as assistant vice president - Investor Relations.

Michelle Gerhardt has been appointed assistant vice president-Investor Relations, succeeding Hamann. Gerhardt has more than 21 years of experience, most recently serving as general director - Financial Analysis.

Todd Rynaski has been appointed assistant vice president-Financial Reporting and Analysis. Rynaski has more than 15 years of experience at Union Pacific, most recently as general director - Information Technology where he led the company's SAP financial systems implementation. He succeeds Jerry Gose, who retired.