Theodore Simadis was born and raised in Thessaloniki, Greece. He was a volleyball athlete with several discriminations in national championships.
In 1998 he was introduced to the Aristotle University in the Department of Physical Education and Sport Science (DEFA), where he graduated with the title of Physical Education Professor. His main specialty is "volleyball coach" and his secondary qualification is "Aerobic and Nutrition".
He attended private schools and graduated with the title of the group fitness instructor.
He is also a student of Alexandrite Technological Educational Institution in the department of Physiotherapy.
Since 2001, he has been working in gyms as well as in private schools of education as a teacher.
Since 2004, he has been a shareholder and manager of private gyms, and in 2010 he was a Group Fitness Manager of Les Mills Hellas, for which he was responsible for 75 health clubs across Greece. In addition, he has been a certified trainer for the Les Mills Body Pump program.
In 2011, he completed the Master Practitioner's Program in Eating Disorders & Obesity, which is being run by the Center for Education and Treatment of Eating Disorders under the auspices of the National Center for Eating Disorders in Great Britain (NCFED).
Since 2014 he is a scientific associate of the Center for Education and Treatment of Eating Disorders and the “diatrofi.gr” group with many speeches at conferences.
In recent years he collaborates with nutrition offices, undertakes personal trainings, management and marketing of sports facilities and gyms, and teaches group fitness programs in health clubs in Thessaloniki.
From 2009 until today, he is co-owner and external scientific associate of his wife's private nutrition office, Stella’s Saripanagiotou.
Also from 2012 until today he maintains his own space where he organizes semi personal therapeutic and healing programs.