Alek was raised in Manchester, New Hampshire in the USA along with his sister Aleen by their Armenian parents Dr. Kevork and Cecil Keshishian. His parents are frequently seen on segments of Chelsea Lately, known as 'Keeping Up With the Keshishians'. While he was a superb student of math and sciences, and his father wished Alek would follow in his footsteps in medicine, Alek's talent and passion for music, theatre, and dance was too strong. As a youngster, both he and his sister toured with the NH Children's Theatre, American Children's Theatre, and the "I Like the U.S. of A." National Touring Company. While studying at St. Paul's School in Concord, New Hampshire, he quickly became the program's lead dancer. Before graduating from Harvard University, he co-produced the then 137-year Harvard tradition of the Hasty Puddings. The Hasty Pudding Show at Harvard claims several future luminaries, including Jack Lemmon and Fred Gwynne.