This article reports on a case study that examined the teacher identity construction of preservice ESOL (English for speakers of other languages) teachers in a 13-month MATESOL program. The findings point out that the TCs negotiated their teacher identities throughout their teacher learning experiences in teacher education courses: 1) Throughout their teacher learning experiences in the activities offered in the IMP courses, they negotiated and enacted their emerging identities as ESOL teachers; 2) their professional interaction with other TCs through formal or informal conversations presented them with a dialogic space in which they framed and tried on their subject positions as ESOL teachers; 3) their simultaneous internship along with coursework was highlighted and acknowledged by their professors and peers, and the three TCs of IMP were positioned as experts of public school system.