From 1987 to 2012, the Giannakopoulos brothers managed
Panathinaikos B.C.,
Panathinaikos V.C., and all of the
Panathinaikos club's amateur sports sections, from the
athletics department to the
water polo department. Thanasis was also the Chairman of the volleyball and
president of Panathinaikos A.O. Thanasis was also President of the basketball club, from 2002 to 2012. Through 2012, Panathinaikos had won 13 out of the last 15
Greek Basket League championships (excluding the 2001–02, and 2011–12 seasons) and the
EuroLeague championship in the years 1996, 2000, 2002, 2007, 2009, and 2011. The club, during that time, also featured some of the best basketball players from Greece, along with star players from abroad, such as
Byron Scott,
Dominique Wilkins and
Dejan Bodiroga. The basketball section of the club alone had a reported budget of €35 million in 2009. In 2011, Thanasis and his brother
Pavlos, won the
EuroLeague Club Executive of the Year Award. In 2012, Thanasis' nephew,
Dimitrios Giannakopoulos, the son of his brother,
Pavlos, took over control of
Panathinaikos B.C. ==Personal life==