an Entity references as follows:
Sebastian Krzysztof Świderski (born 26 June 1977) is a Polish former professional volleyball player and coach. He was a member of the Poland national team from 1996 to 2011. A participant at the Olympic Games (Athens 2004, Beijing 2008), and a silver medallist at the 2006 World Championship. Since 2021, Świderski has been president of the Polish Volleyball Federation.