This study aimed to examine the webinar features, characteristics of professional development activities on the webinar, and the perceptions of English teachers and lecturers towards the webinar and their professional development. The data were collected by observing five webinar sessions of the American Corner of Muhammadiyah University of Yogyakarta. The data collection of this research also used questionnaires administered to 15 experienced and novice English teachers and lecturers from state and private schools and universities in Indonesia as the webinar participants. In addition, nine of the participants were interviewed to gain more insight into their perceptions. The data were then analyzed quantitatively and qualitatively. The results showed that the webinar sessions were supported by online presentation, live chat, Q&A session, and sharing session as its features. Professional development activities on the webinar facilitated English teachers and lecturers in content focus, coaching and expert support, collective participation, and sustained duration. The perceptions of English teachers and lecturers towards the webinar and their professional development showed positive perceptions based on several indicators. Furthermore, the results revealed that the participants had varied responses towards the most influential part of the webinar to their teaching skills. Topics of webinars related to their current and expected teaching practice, preference on professional development activities on the webinar to their teaching practice, and suggestions for webinar improvement.

Keywords : English Teacher, Perception, Professional Development, Webinar, American Corner.