If you don't know who the ones in green are, you should go and look them up. For example:

• Leonhard Euler:
  • solved the Koenigsberg bridges problem,
  • invented Graph Theory and topology, and
  • gave us the truly magical equation
• Fourier: As in Fourier analysis, used to find frequencies in vibrations
• Gauss: Everywhere and everything
• Klein: After whom the Klein Bottle is named.
• Leibniz: Invented calculus at the same time as Newton
• Lagrange: The stable points in orbits are named after him.
• Dirichlet: Proved Fermat's Last Theorem for n=5

• http://www-history.mcs.st-andrews.ac.uk/BiogIndex.html

Quotation from Tim Berners-Lee