Dr. Yiannakis is a Research Professor in the Dept. of HESS and a former Adjunct Professor of Sociology at the University of New Mexico. He is also Professor Emeritus at the University of Connecticut. He holds an 8th Dan in Traditional Jujutsu (USJJF/ATJA) and a 6th Dan in Traditional Kodokan Judo (USA-TKJ). He is the founder (Ryuso) of Wa Shin Ryu Jujutsu, a Japanese-based combat/self defense art.
Prof. Yiannakis is one of the highest ranking traditional Jujutsu instructors in the US and is currently serving as the Chair of the Traditional Jujutsu Committee of the USJJF; he is also the Director of the HESS Institute of Traditional Martial Arts (ITMA) at UNM and a member of the USA Jujutsu Hall of Fame.
In addition to his Jujutsu papers Dr. Yiannakis has an extensive scholarly publication record of research articles in Sociology of Sport and Tourism. One such paper entitled "Forecasting in Sport: A Time Series Analysis with English Premier League Soccer" has been read, according to ResearchGate, over 2200 times and cited in over 700 publications worldwide. In tourism his paper on the "Roles Tourists Play" has received worldwide attention and has also been cited extensively.
Prof. Yiannakis is now semi-retired and is devoting most of his time researching, publishing, teaching and developing Jujutsu in New Mexico and elsewhere in the US.