Instructions Full Game: These are multiple-choice quizzes with four possible answer choices that include all questions in a given set.     
Identify the following individual:

Lived: 1550 - 1617
Best known as the discoverer of logarithms. Also invented the a mechanical calculator named after them and made the use of the decimal point common in arithmetic and mathematics.
Werner Heisenberg
John Napier
Leo Szilard
Hipparchus