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John Davern's work experience begins in 1989 when they joined Maintenance of Fort Worth Inc as a Vice President. John held this position until 2002. In 2002, they joined AHI Facility Services, Inc. as an Executive Vice President, a role they held until 2004. During the same year, they also started working at APEX Group, initially as a Vice President of Sales and later as a Regional Vice President of Sales. The end dates for their roles at APEX Group, as well as the duration of their roles at AHI Facility Services, Inc. and Maintenance of Fort Worth Inc, are not provided.

John Davern attended the University of North Texas, but no specific information about the start year, end year, degree name, or field of study is provided.