Teachers in the 21st century continue to teach with little change to pedagogy, practice, or professional identity. Professional development (PD) remains largely ineffective as a tool for promoting instructional change or new identity formation. Teachers at Senior High School X reflect a significant problem of practice in education: reduced inclination to use information and communication technologies (ICT) in the classroom. This dissertation study was a contribution to existing research on teacher use of the Internet in instruction, and identity transformation. The framework for the study addressed stakeholder assumed influences in knowledge, motivation, and organizational barriers (KMO) that impacted the performance goal of technology-infused instruction. The study was wholly qualitative and the researcher collected data at the school site. Research findings answered the three original research questions: how KMO impacted teacher use of ICT, specifically blended learning, how PD impacted teacher professional identity, and whether innovative delivery of PD could impact teacher inclination to use ICT in the classroom. The three research findings, supported by themes, were: teachers were divided internally, externally, individually, and collectively in terms of KMO barriers, PD impacted professional identity by strengthening teachers as educators if the PD was relevant to their practice, and innovative PD could be a positive experience. Findings suggested that teachers are willing to change. Teacher stakeholders need to be the mouthpiece and leaders of organizational change that promotes meaningful technology-infused instruction. Implications for the field are that teachers need more support, resources, and access, and must possess a strong voice to be at the forefront of (a) identity transformation, and (b) inclusion of blended learning. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]