IPSC started in US, but can be found in other countries as well. US has USPSA, while IPSC is the predominant outside of US and it envelopes all IPSC groups. There are some diffeence between USPSA and IPSC rules so it's hard to compare one-to-one, but IPSC decided to see who ranks where by using the number of points actually achieved by a competitor at an IPSC Handgun World Shoot multiplied by 100 and divided by the total points available.
Currently, Eric Grauffel is the leader in Open and Production Division, while Rob Leatham is the top dog in the Standard and Classic Division.
From: The Firearm Blog