I studied Electronic Engineering at Inha University in South Korea and worked as an embedded software developer.

Since 2008 I have spent 18 years teaching developers on site. I have trained engineers at companies and institutions including Samsung Electronics, LG Electronics, SK hynix, Hyundai Mobis, LIG D&A, and Seoul National University, and I turned that classroom experience into course books.

Books (in Korean): RTOS (2008), Linux Shell (2018), FreeRTOS (2019), Cortex-M (2022), Bootloader-Based Embedded Systems (2023).

On YouTube, my Guile School channel covers embedded systems and software development.

I have also been researching Mac automation for 15 years. I teach how to cut repetitive work with Keyboard Maestro and AppleScript, and I develop and sell Greenlight, an automation plug-in for Final Cut Pro. I publish the tools I build on GitHub (guileschool).

My second YouTube channel, Captain Macbot, shows how to use AI and automation on the Mac.