Dr. John M. Strawn, Ph.D.

Expert Witness

John Strawn, Ph.D., Expert Witness

Welcome to the Home Page of S Systems, Inc., founded by John Strawn, Ph.D., expert witness drawing on his extensive background in software, hi-tech, signal processing, digital media, and music.

Dr. Strawn’s career presaged and then closely tracked the development of software and digital media starting long before the advent of the personal computer and the compact disc. Dr. Strawn has decades of experience in academia and industry as researcher, employee, manager, and independent consultant. He has published widely and is considered to be a skilled teacher.

View Dr. Strawn’s CV here, or download a PDF copy.

Expert Witness

Dr. Strawn is a seasoned expert witness specializing in patent litigation with experience in District Court, the International Trade Commission, and the US Patent Office.  He also handles trade secret and copyright litigation involving software. He is involved in litigation regarding areas such as computers, cell phones, mobile devices, user interfaces, media, compression, and video games. He has been deposed 19 times, testified at trial 3 times including the landmark case Lucent v Microsoft, and submitted 10 IPR declarations in 17 Patent Office IPR filings. Dr. Strawn handles validity and infringement for both plaintiffs and defendants. Based on his own research, he writes his own reports and declarations. View list of litigation assignments.

Software / Signal Processing

Dr. Strawn is an accomplished programmer in high-level languages such as C, C++, and Java as well as in low-level assembly language for digital signal processors. His specialty is the theory and practice of signal processing. He also works with other languages such as Javascript, HTML, XML, SQL. Dr. Strawn draws on experience gathered with mainframe computers and punched cards, mini computers, microcomputers, personal computers, embedded processors, and mobile devices. View list of consulting projects.