The document provides a timeline of important mathematicians from Thales of Miletus in the 7th-6th century BC to Srinivasa Ramanujan in the early 20th century. It notes some of their key accomplishments, such as Thales of Miletus using geometry to measure heights and distances and being regarded as the first philosopher in the Greek tradition, and Pythagoras traveling widely seeking knowledge and influencing Plato. It also includes Euclid, Archimedes, Kepler, Newton, Gauss, and Einstein as major figures in the development of mathematics over the centuries.