Franklin Delano Roosvelt is conseidered one of the greatest leaders of United States because he made through his decisions from a regional political power to an international power. He started and managed to stop The Great Depression (1929-1933) and to intervene succesfully in the Second World War to stop the raising militaristic powers of Germany and Japan.
Peter the Great, Tsar of Russia is one of the Greatest Leaders of History. I think he was an exceptional leader because he was a visionary who studied the main economical powers in his time such as The Netherlands and Great Britain and brought the model of developing in the western way armies, society, commerce and architecture of backward Russia. This changes made his country, one of the modern powers.
Christopher Nolan is not my favourite director, but his works are well known and exquisite. Inception, The prestige, Memento, Interstellar and many more, are famous movies that will remain in the collective memory through ages.
Alfred Nobel is one of the greatest inventors of all time. He invented many things but I know that he invented dynamite and was a succesfull entrepreneur. And of course I admire him, because he started the idea of rewarding science through his prize- the well known Nobel Prize.
Nikola Tesla is one of the greatest inventors of all time. I admire him, because he changed the century that he lived in, through his discoveries in alternating current.
Sir Isaac Newton is one of the greatest personalities in mathematics and physics. Eventhough I am not a passionate physicist, I admire a personality that changed his world through his discoveries and enounced some of the fundamental laws for the modern phisics.
Nicolas Nassim Taleb is one of the greatest author of non-fictional that i read. He wrote some books about philosophy, psychology and matemathics called "The Black Swan", which is a masterpiece for modern thinking.
This was Iustin Capră, and is known for inventing a machine that was the first jet-pack. I think he was a master-mind, but he was unlucky, to be born in a country that hadn't had the possibility to create and to fabricate, what their genius minds could create.
George Carlin is one of the modern philosophers, who is known as one of the Greatest Comedians of all time. I present him, not as a comedian, just because he managed to integrate a powerful message in his acts that changed, for many people the way they perceive society and human nature.
This is Alexander Fleming, the discoverer of Peniciline. I think this personality is great because his invention led to a new era in modern medicine, and peniciline transformed medicine and pharmacology in a Revolutionary way.