Administrative TEam

Gwyneth Zylstra


Gwyneth graduated with a BA in General Studies ('97), BEd ('98) from Trinity Western University and has been involved in Christian education as a classroom teacher, subject specialist, coach and/or program developer ever since. Currently, she is completing a Masters of Arts in Leadership, Theology and Society with Regent College.

Gwyneth lives in Athens, Ontario with her husband and three children whose company she enjoys very much. She is passionate about the pursuit and practice of well-belonging for the staff and students she serves.

Alex van Donkersgoed

Vice Principal of Curriculum Development and Director of IT

Alex van Donkersgoed has been teaching since 2001. In addition to his role with Nimbus Christian Education he is a classroom teacher at Halton Hills Christian School. He attended Calvin College to earn a BA in History and received his OCT from Redeemer University College. He currently lives in Acton with his wife Willena and 3 children. He loves to play basketball and all manner of card and board games. Technology and its role in education has become a significant part of his life.

Ronald Holla

Vice Principal of Finance and Guidance

Ronald became a teacher because he enjoyed teaching Sunday School and speaking from the pulpit as a lay preacher in both French and English. A CPA and graduate of Athabasca University with a Bachelor of General Studies in Business and French, Ronald went on to study Education, then History, graduating in 2001 with a Masters in Education and a Masters in Arts from Royal Military College in 2015. He has been an officer with Air Cadets since 2014.

Ronald has been teaching French, Business, History, English, Careers, Civics and Cooperative Education for twenty years and his vision of education is that of opening up possibilities for students. He is excited at the idea of bringing his Christian worldview into the subjects he will be teaching with Nimbus.

Presently, Ronald lives with his wife of 37 years and welcomes visits from his three grandchildren who enjoy visiting Grandma and Grandpa.


Matthew West

Course Developer and Teacher

Matthew had the privilege of studying at Redeemer University College under an amazing faculty. During this time He developed a passion for learning about God's creation and sharing his understanding with others. Seven years of teaching in the classroom has taught him that the "Eureka" moment is a prized treasure. It is his hope to make new concepts more appetizing and easier to digest, leaving a better understanding and desire to know more.

Sharon Mulder

Course Developer and Teacher

Sharon has been teaching since 2002 and currently teaches grade 8 at John Knox Christian School in Brampton. She is also their Curriculum Coordinator. She loves the challenge of creating units of study that engage and challenge her students. Science has always been an area of passion and the true reward is seeing students discover the wonders of creation through hands-on exploration. She has a BA from Wilfrid Laurier and BEd from Redeemer. Her love of online learning also led her to obtain her Master of Distance Education from Athabasca University, which was, appropriately, delivered online. A Google Certified Teacher, she is no stranger to using a variety of technology tools as well as preparing students to be responsible Digital Citizens.

Sharon and her husband are “empty-nesters” in Caledon. An avid gardener, Sharon thrives on outdoor activity surrounded by nature. She enjoys playing bass and both she and her husband, a bassoonist, perform regularly with the Rose Orchestra in Brampton.

Tiffany Muresan

Course Developer and Teacher

Tiffany Muresan received her Bachelor of Science (majors in math and French) and Bachelor of Education from Redeemer University College in 2015. God has granted her opportunities to teach core French in Ontario and high school mathematics in Wuhan, China. She is currently teaching part-time with Upper Grand District School Board, where she herself began learning French.

She currently lives in Waterloo with her husband and two children. She enjoys learning new games and knitting. Tiffany is passionate about helping students use the gifts God has given them to further His kingdom and to glorify Christ.

Bianca Gagliostro


Bianca Gagliostro is a graduate of Dalhousie University in Nova Scotia, where she obtained her Bachelor of Science, majoring in both Mathematics and Statistics. From there Bianca followed her passion for teaching and was blessed to receive her OCT designation from Redeemer University College. Bianca continued to grow her knowledge and received advanced qualification in Senior Level Mathematics and Special Education from the University of Toronto. Bianca’s special education background has found success accommodating diverse student needs and facilitating different type of learning approaches.

When she’s not a devoted teacher. Bianca enjoys spending time with her 2 kids and husband. She enjoys grain-free baking and travelling with her husband and children.

Catharine Kruitbosch

Course Developer and Teacher

Catharine Kruitbosch received her Bachelor of Education along with a Bachelor of Arts in Integrated Studies minoring in French and English Language and Literature from Brock University in 2012. She has held various teaching positions in both public and private schools, and currently works as an Occasional Teacher with the District School Board of Niagara as well as Jordan Christian School. She currently lives in St. Catharines with her husband and 3 young children. She loves to read almost anything, but especially enjoys biographies and memoirs. She also loves being outside and camping, running, hiking, or biking with her family.

Rebecca Eggert

Course Developer and Teacher

Rebecca Eggert has been teaching in Christian school, homeschool, Sunday school, summer camp, and tutoring for over 20 years. She graduated from Brock University with her concurrent Bachelor of Science (Math) and Bachelor of Education in 1997. She has taught and tutored all subjects but her favourite has always been math. She is currently working as a high school teacher at Vianney Academy as well as Nimbus Christian Education. Rebecca lives in Mississauga with her husband, her three teenaged children, and her B.F.F. (best furry friend) January. Rebecca loves dogs, hiking, spending time with friends, but most of all...Jesus.

Karen Timson


Karen Timson worked for York Region District School Board throughout her teaching career in a variety of roles, e.g. secondary mathematics teacher, department head of mathematics, intermediate/senior mathematics consultant. She has her Masters of Education in Curriculum and has taught Additional Qualifications Courses for teachers at OISE (Ontario Institute for Studies in Education) both face-to-face and online.

Karen retired from YRDSB in 2011 to pursue other interests in mathematics education including short-term teaching contracts in Christian schools in Portugal and New Zealand, starting a tutoring business and volunteering at a local Christian school in their mathematics program.

She lives in Stouffville.

Scott Newbury

Course Developer

Scott Newbury has been teaching since 2003 and is currently employed at Brampton Christian School (since 2007). He attended Memorial University of Newfoundland where he graduated with a Bachelor of Science (Joint-Major in Physics and Applied Mathematics) and a Bachelor of Education. He enjoys teaching Math and has taught many of the courses offered at the high school level.

He currently lives in Orangeville with his wife, Heather, and two daughters. They are a musical family and play multiple instruments and lead worship in church. He enjoys sports (such as Badminton and Ultimate Frisbee) and is also very interested in technology.

Heather Smid

Course Developer and Teacher

Heather Smid earned a Bachelor of Arts (Honours) in English Literature from Queen's University in 2004 and a Master's degree in English Literature from Queen's the following year. She currently works at Heritage Community Christian School.

Heather lives in Frankville, Ontario with her husband, four children, and assortment of pets and farm animals. She loves vegetable gardening and tending to her small hobby farm, and in her spare time she makes and sells goat's milk products.

Marsha Vandergaast


Marsha Vandergaast was born in Sioux Center, Iowa and grew up in Jenison, Michigan. She moved to Canada where she met her husband, Gary, and had two children. She has taught in Bowmanville, Ontario and Ottawa, Ontario for over 35 wonderful years. Although teaching was not her original intention, she soon saw that it was God's plan for her life and that is was the most wonderful work in the world. She is now retired from full-time teaching but is still active in supply teaching, volunteer work, and church activities. She has two wonderful grandchildren and loves to hike and ride a motorcycle.

Ginny Mejia


Ginny Mejia is originally from Colombia with more than 12 years of teaching experience both Online and face to face. She received her master’s degree in TESOL and Intercultural Studies in 2021 from Wheaton College, IL. For the past 10 years she has been serving as a Missionary with Operation Mobilisation (OM) where she has worked as an ESL teacher (in the UK) and a Youth worker (in the Netherlands). Right now, she is serving part time with OM International teaching about Cultural Intelligence to the cross-cultural workers in the organisation. She moved to Canada three years ago with her husband and now they enjoy the company and cuteness of their baby girl who is 2 and a half. Ginny loves to learn about different cultures and to see how God manifests aspects of Himself through them.

Julianne Weeks


Julianne has a double BA in English and Psychology from Wilfrid Laurier University. She has a passion for teenagers! She has been teaching in the Christian high school environment for over 20 years. She started in Bloomingdale, ON at Koinonia Christian Academy and helped to develop their English curriculum as the high school grew. She has taught a variety of different courses over the years (Intro to Business, Philosophy, Psychology, ESL), but her main love is anything to do with English (Grammar, Writer's Craft, Studies in Literature, along with all the regular core courses)! She is now teaching English at Discipleship Christian Secondary School in Breslau, ON.

Julianne is an active member at her church and loves to connect through organized small groups as well as over a meal or a game with friends. She has lived in the Kitchener-Waterloo area for over 30 years and has raised her family of 3 grown kids there. She and her husband have been married for 26 years. If not in the classroom, you can find Julianne curled up on the couch reading, in the kitchen baking, or playing with her puppy.

Debika Thiruchelvam


Debika has a degree in Biomedical Sciences from the University of Guelph (2014) and a Bachelor of Education degree from the University of Windsor (2015) specializing in the intermediate/senior division. She has taught ESL classes to adult learners, high school math and science courses (grades 9 - 11), and homeroom for grades 7 and 8. Debika has experience teaching and designing asynchronous online courses, which is what inspired her to obtain her Master of Education degree with a focus on distance education from the University of Ontario Institute of Technology (2019). She is currently teaching grade 8 at John Knox Christian School in Brampton. Debika lives in Brampton and enjoys reading (particularly about theology, science and books at the intersection of both), hiking and coffee.

Rachel Fouad


Rachel graduated from York University in 2009 with an Honors Bachelor of Arts in French Studies and a Bachelor of Education. She has taught in both public and private schools focusing mainly on French as a Second Language.
Rachel lived in Mississauga where she is very involved in her church, serving on the worship team and leading the women's ministry. She also loves spending time playing games with friends and hanging out with her husband and four children.

Trent Coleman


Trent Coleman was born in Sarnia, Ontario, and has lived in South Korea as well as three Canadian provinces. He currently resides in Nanaimo, BC, with his family.
Trent is an Ontario certified teacher who has been a junior-intermediate classroom teacher in Christian schools in BC and Alberta and spent several years in South Korea teaching EFL. He has been teaching online since 2015, and as an online tutor has several years of experience teaching a variety of subjects including English language arts, mathematics, core French, history, and ESL.
Trent enjoys singing and writing worship songs, playing the keyboard and guitar, writing stories, and playing board games. He is ready to work with you today.

Bill Friesen


Bill Friesen has been teaching for over 20 years at the university, college and high school levels, teaching everything from ancient history and literature right through to cutting edge science fiction and fantasy, though he earned his Ph.D. in medieval literatures. He has also taught various writing, university preparation, Latin, and public speaking courses. In addition, Bill has served as vice president of an academy, director of a university writing centre, and chair of a university academic standards committee. His wife presently works as an administrator the Henry Nouwen Society. He attends Grace Church in Newmarket, ON. He loves spending time with his wife and three daughters, teaching, reading, hiking, camping, traveling, and fishing.

Stephanie Schilstra


Stephanie Schilstra received her Bachelor of Education from Brock University in 2014. She currently teaches Computer Studies at Niagara Christian Collegiate, and has also taught Technology, Science, Geography and Math. Stephanie lives in Stevensville with her husband and 2 young boys. She loves to play sports, especially golf, volleyball and baseball She also loves being outside and camping with her family every summer.