Building Confidence.
Developing Fluency.

One-on-one English coaching for Korean professionals

FAITH · SERVICE · EXCELLENCE

Book a Lesson

An online English coaching session, with a student taking notes at her desk.

Why Cornerstone?

CELTA certified

English teaching grounded in an internationally recognized qualification.

Experienced coach

Years of helping adult English learners communicate with confidence.

Detailed feedback

Personalized corrections so you know exactly what to work on next.

Personalized coaching

Lessons shaped around your goals, your interests, and your learning style.

Build the Skills that Matter

Pronunciation

Speak more clearly and naturally.

Sentence building

Give your ideas the structure they need.

Vocabulary development

Find the words for what you want to say.

Smoother conversation

Build confidence through real conversation.

English Skills Diagnostic

Know Where You Stand. Know Where to Grow.

Every learner has different strengths and areas where they can improve. Students who purchase a lesson package are invited to complete an English Skills Diagnostic with Zach.

This multiple-choice assessment helps identify where focused instruction can help most. It isn’t a pass-or-fail test—it gives us a starting point for lessons built around you.

You can take it again later to see how far you’ve come.

AssessIdentifyImproveMeasure

Daily Bible Verse

“But as for you, Bethlehem Ephrathah, too little to be among the clans of Judah, from you One will go forth for Me to be ruler in Israel. His goings forth are from long ago, from the days of eternity.”

Micah 5:2 · NASB

Building Confidence.Developing Fluency.