Two men have re-engineered the US electoral system in favor of Republicans

"…Jankowski pioneered Redmap, short for the Redistricting Majority Project. That 2010 strategy, coordinated when he worked at the Republican State Leadership Committee (RSLC), flipped state legislative chambers in Ohio, Michigan, Pennsylvania, Alabama, North Carolina, Wisconsin, Indiana, Tennessee and several other states just ahead of the decennial redistricting. Then, with complete control of those processes, as well in Florida, Georgia, Texas and elsewhere, the RSLC helped draw some of the most extreme partisan gerrymanders in history, locking in huge Republican advantages in state legislatures and congressional delegations…" 

Leonard Leo is the other.

https://www.theguardian.com/commentisfree/2024/oct/04/electoral-college-map-gerrymandering