Gary Simon is a US designer-developer behind the DesignCourse YouTube channel and the Coursetro teaching platform. His distinctive contribution is bridging the design and front-end engineering disciplines — covering Figma and Adobe XD alongside Three.js, advanced CSS, and the more visual end of front-end work.
His CourseFlix listing carries two Gary Simon courses: Kickstart your UI/UX Design Career — DesignCourse UI/UX and Advanced FrontEnds (Three.js / advanced front-end). Material is paid and aimed at developers wanting to extend their craft into design or designers wanting to ship code.