Life Time Fitness says Eric Buss to assume role of interim CFO, effective Mar. 2 As announced on August 27, 2013, Michael Robinson plans to retire as executive vice president and CFO a 12-year tenure with the company. The effective date of this transition is March 1, 2014. The company plans to retain Robinson as an employee or consultant for a period of time thereafter. Effective March 2, Eric J. Buss, who currently serves as executive vice president, will assume the additional role of interim CFO. Buss joined Life Time in September 1999 as vice president of Finance and general counsel.