Welcome to the Home Page of S Systems, Inc., founded by John Strawn, Ph.D. to offer consulting and litigation services primarily related to software, 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.

Litigation Support

Dr. Strawn is a seasoned expert witness specializing in patent litigation with experience in Federal Court, the International Trade Commission, and the US Patent Office.  He also handles trade secret and copyright litigation involving software. He has been deposed 19 times, testified at trial 3 times including the landmark case Lucent v Microsoft, and submitted declarations in 5 sets of IPRs. 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.


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. 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.