I work since 2010 as a full time tutor and I assist yearly about 100 students. I have a B.Sc. in Economics, a M.S. in Math and an interdisciplinary Ph.D. in Math, Computer Science, and Physics from top German universities, I worked at international research labs, universities, and companies in Germany, France and in the US. I came 1999 as a post-doc at LBNL to Berkeley.