Gumplowicz family search in Poland with possible Russian roots on one side of the family 1. Open

My father was Maciej Bronislaw Gumplowicz. I never met him, and have very little information about him. What I do know was that he was a doctor and also founded a Polish Yacht Club in London. He died in London, UK, on 9 July 2019. Here is a piece written about his death: http://www.kulinski.navsim.pl/art.php?id=3512&page=150. I believe that he first came to the UK around 1975 (approximately). He possible came from Warsaw. I have been told before that his father was Polish and his mother was Russian. This is about all I know about him and the family on the Polish (and Russian) side. I would greatly appreciate any assistance in finding more about him and his family and my Polish roots.