The author of the book (Taha Sochi) possesses a diverse academic and research background. He holds a BEng in electronics engineering, a BSc in physics, a PhD in petroleum engineering, a PhD in crystallography, and a PhD in atomic physics and astronomy. He also worked as a postdoctoral research associate for several years. He published dozens of scientific research papers in many refereed journals and produced numerous academically oriented documents which are freely available on the world wide web. He also authored several books on tensor calculus, differential geometry, Lorentz transformations, general relativity, mathematics of variation, complex analysis and quantum physics.