Peter David Lax (born 1 May 1926) is an American mathematician working in the areas of pure and applied mathematics. He has made important contributions to integrable systems, fluid dynamics and shock waves, solitonic physics, hyperbolic conservation laws, and mathematical and scientific computing, among other fields. Lax is listed as an ISI highly cited researcher.He received Lomonosov Gold Medal award in 2013 for outstanding contribution to the theory of hydrodynamic solitons.