My friends and I were fortunate enough to meet Jonas while on Ko Phi Phi this past month. I believe we were one of his first classes he taught on Ko Phi Phi and he was very patient and informative throughout the entire class! If you are on island I definitely recommend taking his or any classes offered at Keirtas! Jonas is also an excellent climber, so if you're looking for a climbing buddy, look him up! ALOHA!