This longitudinal mixed methods study investigates the development of teacher candidates' professional identity throughout a four-year degree program. Data were analyzed using the following dimensions of professional identity: task orientation, self-efficacy, commitment to teaching, and professional orientation. During practicum, teacher candidates were able to realize the ideals articulated in their teaching philosophies, including a strong focus on student engagement. Their self-efficacy grew as they developed a sense of purpose in teaching and committed to future growth in assessment. Professional orientation flourished in supportive school-based seminars. All participants remain committed to teaching in part because they were able to persevere through challenges. Program features supporting professional identity are discussed.