Walkup was first elected
on November 2, 1999, defeating
Democratic former City Councilwoman Molly McKasson and local businessman Bob Beaudry. Benefitting from a split in the Democratic vote, he was sworn into office on December 6, 1999, succeeding two-term Tucson mayor
George Miller, who retired from office as the city's longest-serving official. He became the first Republican mayor of Tucson since 1983. During his first term as mayor, Walkup intervened after both the
University Medical Center and
Tucson Medical Center announced the closure of their trauma centers in 2001. He phoned every hospital in the city and hosted a meeting at his office, where plans were formulated for a new world class trauma center, opened on January 8, 2008. During this tenure, he became the first mayor in his state to sign the
U.S. Mayors Climate Protection Agreement and presided over the development of Tucson's
solar energy capability. He was partly responsible for amalgamating the economic development agencies into a single regional organization in 2005. after the Democrats opted not to field a candidate. Walkup announced on February 22, 2011 that he would not seek re-election after his current term ended in December. Democrat
Jonathan Rothschild won the
election and was sworn into office on December 5, 2011. ==Personal life==