I completed my PhD under the supervision of Mieczysław Omyła who was a student of Roman Suszko, who was a student of Kazimierz Ajdukiewicz, who was a student of Kazimierz Twardowski, who was a famous Polish philosopher and a teacher or a teacher of teachers of the leading Polish philosophers, logicians, and mathematicians: Kazimierz Ajdukiewicz, Stefan Banach, Tadeusz Kotarbiński, Jan Łukasiewicz, Stanisław Leśniewski, Alfred Tarski, among others.
For my mathematical genealogy tree see here (bottom of the tree) and here (top of the tree).