The former Harps and Sligo Rovers defender will take up the position following his role at Letterkenny Rovers where Trevor has been first team manager since 2013.
The Finn Harps Academy currently has three age groups expanding to five for the 2015 season.
Trevor previously worked as an F.A.I. Development Officer and Regional Emerging Talent Centre Co-Ordinator & Coach and holds qualifications as a F.A.I. Coach Education Tutor and a Child Protection Course Tutor.