Radley Elementary School Principal Joe McMahon is set to retire this summer after a near 40-year career in education. McMahon is a well known face in the East Helena School District. For the past 13 years, he has been the principal at Radley. During the 13 years before that, he was the principal at Eastgate Elementary School. Prior to joining the East Helena School District, he taught fourth and fifth grade for 13 years in Montana City. McMahon said 13 must be his lucky number and wondered what may happen 13 years from now. According to McMahon, it was time for him to retire after 39 years in education. His wife, who is a teacher at Helena Middle School, retired last year. McMahon said it was time for them to spend more time with their grandchildren.