Mather grew up in Madison, Wisconsin. He graduated from the University of Wisconsin–Madison in 1984, earning a Bachelor of Arts degree in accounting and risk/insurance. He worked as a Certified Public Accountant firm for five years, before joining the front office of the Minnesota Twins, starting as their director of finance in 1989, and receiving a promotion to vice president in 1992.
Mather joined the Mariners organization in 1996, serving as executive vice president of finance. He was in charge of overseeing the building of Safeco Field. In January 2014, he was selected to succeed Chuck Armstrong as team president.
In July 2018, a Seattle Times article reported that Mather contributed to creating a hostile workplace environment for women. Mather had been the subject of two workplace complaints from female employees in 2009 and 2010. In both instances the employees were compensated an undisclosed sum. The two women eventually left the organization; Mather was retained and is still CEO as of the time of the article.
- "Kevin Mather named Mariners President & COO; Bob Aylward named Chairman of NW Sports Net LLC (the regional sports network ROOT Sports NW)" (Press release). MLB.com. January 24, 2014. Retrieved January 29, 2014.
- "$n$ Mariners CFO visits Walla Walla". Walla Walla Union-Bulletin. Union-bulletin.com. March 30, 2012. Retrieved January 23, 2014.
- "Mariners set to look internally for new president | MLB.com: News". Mlb.mlb.com. May 24, 2013. Retrieved January 23, 2014.
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