Say hi to some of our directors, advisors, teachers & operations team. 


Joshua O'Sullivan

Founder & School Director

Joshua is from Australia and moved to Japan in 2008 after graduating university with Bachelor of Science and a Bachelor of IT.
With his background in business,  education, and Church communities, Joshua founded Zoe International School in 2021 in response to the growing need for an affordable, quality international in Yokohama.
He and his wife Yuki live in the Gold Coast in Australia with their 5 children and commute between Australia and Japan.

Patrick McGinty


Patrick is from the USA and grew up in Japan as a child with his family.
Together with his wife Ellen they have 3 children and pastor Cross Community Church in Center-Minami.

Michael McClain


Michael is from the USA and has lived in Japan for 5 years.
Together with his wife Shelly they have 4 children and pastor Yokohama International Church in Kannai.


Kasumi Arciaga

Interim Principal, Middle School & High School Teacher

Kasumi is from Yokohama and graduated from university in Florida, USA and Temple University Japan for her Bachelor of Arts and Masters in Education.
She has experience in teaching at schools, afterschool programs and in business and currently finishing her PHD in Applied linguistics.
Together with her husband Moncarlo they have 3 children and have recently moved back to Japan from the Philippines.

Sarah Madhavan

Elementary Teacher

Sarah is from the United States of America. She received her Bachelor of Arts degree in elementary education and learning disabilities from Spring Arbor University and her Masters in Education in Literacy with a focus in English as a Second Language from Clemson University. She has experience working as an elementary school teacher of students with exceptionalities, as an English as a Second Language teacher, and as a literacy specialist. She loves being a part of her church family, doing anything outdoors, and drinking lots of coffee to keep up with her students. She is passionate about making sure every student’s gifts are developed and celebrated.


Shelly McClain

Elementary Teacher & School Nurse

Shelly is from the USA and has experience in teaching, homeschooling , music and vocal coaching.
Shelly holds her certification as a surgical technician and has many years experience working in health.
She is married to Michael and they have 4 children who have all attended international schools in Japan.

Rina Tamakoshi

Elementary Teacher

Rina is from Japan and is a graduate of the international school system, graduating from International Christian University with a Bachelor of Liberal Arts in Language Education and a Master of Arts in Education. She has experience teaching English to students of various ages, from young children to high school students. She loves eating donuts, going to a nice cafe, and spending time with her family and church family. It excites her whenever she sees someone discover their strengths, and she is passionate about letting students know that they are special and loved for who God created them to be.



Edwin Portillo

Middle & High School Teacher

Edwin is from El Salvador in Central America. He received his Teaching degree with focus on English Teaching Methodologies from the University of El Salvador and his TESOL certification from Arizona State University. He has experience as an English as a Foreign Language teacher at K-12 schools in both El Salvador and Japan. Edwin enjoys practicing outdoor sports and is a keen videography enthusiast. He also loves to get involved in his local church and community service. He is inspired  by seeing students fully develop their potential and taking their creativity and knowledge to the next level.



Kies Kiteah

Middle & High School Math Teacher

Kies is from Liberia and has a Bachelor of Science.
He is currently studying Engineering as a graduate student at the Tokyo Institute of Technology.




Hana Yoo

Operations Manager & PTA Co-Ordinator

Hana is from Korea and studied in the Gold Coast, Australia for her Bachelor in Hospitality.
She is excited to bring the sense of hospitality to Zoe, ensuring the best experience for teachers, students and parents.
Hana also has a TESOL teaching certificate and assists with bilingual learners.
Together with her husband Youngmin they have 2 children and have lived in Japan for over 10 years.

Rome Aguila

Finance & Accounting

Rome is from the Philippines and has a Bachelor of Accounting and CPA.

Hayasaka Tax Accountants