John Ralston Saul — author, president of the writers’ organization PEN International, and former vice-regal consort to former governor general Adrienne Clarkson — has had considerable influence in Canada and elsewhere. His unique style of writing can be recognized after just a few lines. He is hyper-educated, filling his work with references from the West in the 1600s to the present day, with the occasional leap back to the ancient Greeks or Romans. He takes a much broader historical sweep than almost any other writer who touches contemporary topics. 
Read any of his books, and you will come away with new stories: about a French resistance fighter during WWII named Jean Moulin, about a female contemporary of St. Francis of Assisi named Elizabeth of Hungary, about the 18th-century Corsican patriot Pascal Paoli. You can read about how ancient Greece's civilization began to flower because of the cancellation of debts by Athenian statesman Solon, or how the current period of globalization looks from New Zealand and Malaysia.
In a series of books about Canada, he has resurrected the history of responsible government and the political leaders Louis-Hippolyte LaFontaine and Robert Baldwin, arguing they showed the world that you could “talk your way out of the Empire,” a method that was adopted by dozens of other countries after Canada showed the way.
JRS brings fascinating characters to life, as well as tragic statistics. From one of his books I found out that in some years Alberta brought in more money from gambling revenues than from tar sands royalties, so low were the royalty rates and so high was the stealth tax set up through promotion of gambling among society’s elderly and vulnerable. Elsewhere he describes how Canada entered a health care crisis not because single-tier public health care is unaffordable but because of a decision in the 1990s to lower the number of doctors available to the population.