Your poll question uses the term "whisk(e)y", which implies all global whiskies. If we are to take this objectively, then there can only really be one answer.
In scotch circles, Michael Jackson appears to have the most influence. His Malt Whisky Companion is the bible of many scotch drinkers, his other books on scotch are similarly revered, and of course, his writings appear in periodicals, newspapers, magazines, etc. It's also worth bearing in mind that MJ is also recognised as a (the?) leading authority on beer.
However, looking globally at whisk(e)y, Jim Murray obviously looks at the big picture. Scotch is merely a chapter in his books, which also focus on Irish, American, & Canadian whiskies. (Japanese also!). And yet, he shuns writing for magazines & periodicals, and so his influence extends only to those who read his books. If your interest/preference is bourbon, than JM will be your guru, rather than MJ.