Per Fiserv's SEC filing, Mr. Best was appointed principal accounting officer of Fiserv effective April 1, 2016. He joined the company in 2010 as vice president, corporate controller; was promoted to senior vice president, corporate controller in 2014; and became chief accounting officer on March 1, 2016. (Age 45 as of 2016 per that filing.)
Where the filing does not disclose a value, this page states "Not disclosed" rather than estimating. Smaller filers are exempt from disclosing metric targets and achievement, and larger filers may omit forward targets for competitive reasons.