Think of top 10-20-30 global experts in your specialty or area of interest. You may be interested in a topic outside your "daytime" clinical focus - that's also perfect to explore. Think of 3 expert categories: (1) Established KOLs. H-index >50 likely. (2) "Rising stars": under 50, active at conferences, recent lead authors on NEJM / Nature / Science papers, etc. (3) "Contrarians": someone known to hold an alternative view of the prevailing dogma on any topic. Think Drs. Barry Marshall and Robin Warren before the Nobel Prize for H. Pylori. Think Dr. Alain Cribier (Rouen, France) before TAVI became SOC.