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I'm an American physicist/mathematician now working in finance. In my academic life I worked mainly on packing problems, such as trying to find the best way to pack regular tetrahedra, trying to figure out if any convex solid packs less efficiently than the ball, and developing methods to search for new and interesting packing arrangements of spheres in higher dimensions. I also found time to work on how to move a sofa around a corner, modeling trade of nutrients between microbes, and looking at the thermodynamics of clusters formed by sticky spherical colloids. I'm now working on quantitative aspects of trading equities, options, futures, and ETFs at a proprietary trading firm.