Frank Vahid (PhD) is zyBooks Co-Founder and Professor, Computer Science and Engineering, University of California, Riverside. Dr. Vahid has co-authored over 120 conference and journal papers, including numerous best paper awards. He is co- author of the textbooks Digital Design, VHDL for Digital Design, Verilog for Digital Design & Embedded Systems (John Wiley and Sons). Prof. Vahid is the recipient of the Outstanding Teacher of the UCR College of Engineering Award and the Teaching Excellence Award. He has mentored seven PhD students who are now professors at prestigious U.S. universities.