Waldemar Grzechca was born in Gliwice in Poland. He graduated at the Silesian University of Technology in 1989 and at the same time he started working at the Department of Automation Control, Electronics and Computer Science. His research was focused on accuracy of robot trajectories and robot applications in manufacturing companies. Next, he has moved his research and interest to manufacturing systems. He studied different structures of machines (sequencing and scheduling in single machine and parallel machines configurations, job shop system, flow shop system, etc.). He is especially interested in assembly lines balancing problem. He investigates different types of lines and focuses on estimation of final results of balance of single and two-sided lines. He is author of more than 60 conference and journal papers which deal with assembly lines problems.