He eventually was promoted to chairman of the Accounting Department at Murray State, and he held that position for two different times: from 1977 to 1981, and 1985 to 1998.
Miller also served as executive director of the Murray State Foundation from 1991 to 2010 as assets grew from 31 to 100 million dollars.
Outside of his higher education career, Miller has worked as either an owner or partner of a public accounting firm since 1978.
Miller has also served on a number of boards of directors, including the Murray Electric System, Heritage Bank, and Murray-Calloway County Hospital.
In June 2013, following the departure of Randy Dunn, the Murray State Board of Regents voted unanimously to once again name Tim Miller as the interim president of the university.
In March 2014, the board voted to remove interim from Miller's title, naming him officially as the 12th president of Murray State University.