top of page
We are a family run martial arts school founded
in april 2010.

jsk taekwondo is OWNED & operated
by joe Karstadt & his wife kate karstadt.  
they have 5 children;
josh, elliot, max, isabella & OCTAVIA



Owner - Founder - Head Instructor

6th Degree Black Belt

Mr. Joe has been training in TaeKwonDo for almost 35 yrs.  His ability to connect with his students and bring out the best in them is second to none.  His dynamic teaching style ensures that each student is getting the most of their training and although he is strict, he is always fair.  Mr. Joe is a member of the U.S. TaeKwonDo Team and has competed successfully in 10 International Competitions and holds more than 25 National Championship Titles.  He was a member of the U.S. Men's TaeKwonDo Team that won 2 Gold Medals at the 2004 ITF

World Championships in South Korea.  

He is also a member of the Official TaeKwonDo Hall of Fame.

Best MA Teachers 2020.png
Best MA Teachers 2021.png
Best MA Teachers 2021.png


Owner - Director

Mrs. Kate is the brains and organization behind JSK TaeKwonDo.  Her impeccable attention to detail is what makes JSK what it is today.  From scheduling your first class, to organizing your child's next birthday party and beyond, she is the one to get it done!



Instructor - JSK AZ & NH

4th Degree Black Belt

Being the son of Kate and Joe Karstadt, Josh has already been exposed to martial arts for over 15 yrs and is a member of the U.S. Junior Boys TaeKwonDo Team.  He has competed in 7 International Tournaments and holds 13 U. S. National Titles.  He has a great ability to inspire students to always want to be better and is an essential component of the JSK Teaching Staff.

IMG_0054 EDITTED.jpg
  • Facebook - Grey Circle
  • Instagram - Grey Circle
bottom of page