Mackenzie was born and raised in a small town in New Jersey, where she began acting at age 5. Appearing on the back of Quaker Oatmeal and Banquet Dinner boxes, Mackenzie was busy being the "All-American girl-next-door". She has also worked with many well-known actors in several appearances on Saturday Night Live, being Kristen Stewart's stunt double in Panic Room, and featured in Riding In Cars With Boys and Double Parked. She graduated Magna Cum Laude from Monmouth University in 2009, majored in Psychology, made the Dean's List two semesters in a row, and was initiated in the Psi Chi and National Scholars' Honors Societies. She is trained in stunt work, falls, wire work, stunt jet ski driving, and has years of experience handling, shooting, and loading fire arms (hand guns and rifles). She lives in California and is pursuing graduate studies in Clinical Therapy/Counseling while pursuing her busy acting career.