Przemyslaw Kiciak was born in 1961 in Warsaw. He studied at the Warsaw University of Technology (Faculty SiMR-Cars and Working Machines) and then at the University of Warsaw (Faculty MIM-Mathematics, Informatics and Mechanics). Since 1992 he has been working at the University of Warsaw (Faculty MIM). His scientific interests are in the area of computer graphics, geometric design and numerical analysis. Przemyslaw Kiciak is the author of an open source software package called BSTools, which consists of a number of procedures (written in C) processing spline curves and surfaces. All figures in this book (except 6.8 and the authors photo) have been drawn or rendered using this package.