Blaine and Judy Richards of Trenton are pleased to announce the engagement of their daughter, Colby Richards, to Ryan Lindemann, son of David and Patricia Lindemann of Hampden. Colby is a 2008 graduate of Mount Desert Island High School. She studied elementary education at the University of Maine and now teaches at Princeton Elementary School in Princeton, Maine. Ryan graduated from Hampden Academy in 2008, then went on to study chemical engineering at the University of Maine. He is the safety manager at Woodland Pulp LLC in Baileyville. The couple live in Calais. An October wedding is planned.