In August 1967, he emigrated to the US and began teaching tang soo do[4] at the University of Cincinnati in Ohio.
In 1974, Ahn was a founding member of the Amateur Athletic Union's Taekwondo Committee.
The World Taekwondo Federation (WTF) awarded Ahn his Master Instructor certification in 1977.
These masters and students made their mark as Taekwondo instructors, International Referees, state and national champions and successful business leaders in many fields.
Noted as much for his patience and kindness toward students as he is his ever-demanding standards of perfection within the study of Taekwondo, Ahn is known as a beloved mentor to thousands of who have learned under his instruction over the last half-century.