Who is the top 1 mathematician?

Who exactly do you consider to be the top mathematician in the world today? Is it based on their contributions to pure mathematics, or do you factor in their impact on applied mathematics and related fields? Furthermore, how do you measure their influence and achievements, considering that there are numerous branches of mathematics and various ways to assess success? Lastly, are there any recent developments or breakthroughs that have shifted the perception of who the top mathematician is?