[2] He was Speaker of the Wyoming House of Representatives in 1951 as a Republican.
[3][4] He was Secretary of American Samoa under John Morse Haydon.
[5] Mockler took the office of Governor of American Samoa on October 15, 1974, and ended his term on February 6, 1975.
[6] After leaving the governor's seat, Mockler moved to Longboat Key, Florida.
When Haydon was recalled for interfering in the gubernatorial election process, Mockler was appointed Governor with the understanding that his term would last only a few months.