Casco Bay High School in Portland held its 2015 commencement Thursday evening at Merrill Auditorium, awarding diplomas to 64 graduating seniors.

Casco Bay is Portland’s public expeditionary high school, which emphasizes interdisciplinary, project-based learning.

Sebastian Andrew, who plans to attend Concordia University in Montreal, was the class speaker.

Liam Fowler, who plans to attend Middlebury College in Middlebury, Vermont, was recognized as the graduating senior with the highest grade point average.

The school does not have a formal valedictorian or salutatorian.