Meet Ian O'Sullivan,
Founder of TEFL Institute.

Helping thousands of teachers launch life-changing careers abroad, and reshaping what modern, accredited TEFL training looks like.

Short Bio

Ian O’ Sullivan is the founder of TEFL Institute, one of Ireland’s leading accredited TEFL course providers.

With more than 30 years in international education, Ian has helped over 50,000 students become qualified English teachers in more than 30+ countries. He is based in Ireland and also leads TEFL.ai and TEFL.ie.

From Classroom to Category Leader

I started in education the way many people do, standing in front of a class, learning on the job, and quickly realising how much teacher training really matters. What began as a personal passion for travel, language and teaching turned into something bigger: a mission to make high-quality TEFL qualifications genuinely accessible, wherever you are in the world.

Over the last 30+ years, I’ve worked across the TEFL industry as a teacher, trainer, course designer, and now as the founder of TEFL Institute, TEFL.ai, and TEFL.ie. I’ve seen the sector evolve from photocopied handouts and noticeboards in hostels to fully online, accredited, internationally-recognised qualifications used by schools and recruiters in every corner of the globe.

Why the TEFL Institute exists

Quality first

Accredited, regulated courses
designed by teacher trainers.

Support that actually supports

Tutor access, job guidance and
real support.

Teaching should change lives

Impact for teachers and
students worldwide.

"After two decades in TEFL, the biggest shift I've seen isn't technology - it's expectation. Students today want accreditation, real tutor support and a clear route to a job. Anything less isn't a TEFL course, it's a PDF."

- Ian O'Sullivan, Founder, TEFL Institute

50,000+ Students

80+ Countries

30+ Years

Level 5 Accredited

Credentials & Recognition

Qualifications: BA, CELTA/Trinity, MA in Education [update]
30 Years in international TEFL education
Focus: Accredited online TEFL training, AI-powered teaching tools, and global teacher career support.

Outside of work

When I'm not working on the business, you'll usually find me travelling, at a gig, in Ibiza, or somewhere with good music and better coffee. That love of travel is genuinely where TEFL started for me - and it's still what keeps the mission personal.