The Elder, John Wick's main antagonist, and the High Table, both play crucial roles in the rich mythology of the franchise. For hired guns like John Wick, the High Table provides oversight to the world's most powerful criminal organizations. There are twelve seats on the council and each spot goes to a different member of a specific group. The Russian Mafia, Cosa Nostra, Yakuza, and Triads are all confirmed to have a seat at the table. The High Table determines Continental leadership, the Bowery King, the Director, and many others. The Elder in John Wick is the one who controls the High Table and all these other organizations.

https://screenrant.com/john-wick-high-table-elder-explained/