David Benaim is considered by Microsoft to be in the top 100 or so Excel users worldwide by holding the Microsoft MVP award, he has a YouTube channel with tech tutorials with over 18,000 subscribers under his name David benaim and does 50+ webinars/presentations per year on Excel/public speaking. 

David keeps up to date with new Excel features so much that he contributes to every official Microsoft Excel monthly blog post and he also runs Xlconsulting where he assists with process automation and analytics via Excel.