I have an undergraduate and master's degree in economics, and a PhD (candidacy) in industrial engineering. As part of some research I have been doing on campus, I have discovered my true calling: to build hardware and software to help promote democracy and improve the lives of people in minority communities and developing countries. As a result, I have decided to study electrical engineering, in embedded systems, I think. The question is what is the best way to do so after having obtained a PhD. First, there is the issue of prerequisites. As an economist by training, I only possess the minimal math required for economics and industrial engineering. I've never taken physics, biology or chemistry, other than in high school. I assume I will need to take these prerequisites -- at least, math, physics, and chemistry -- to study electrical engineering. Second, do I do a Master's degree, and if so, in what concentration? My interest is in HW and SW engineering and in communications like mixed signals or DSP. Would this be a concentration in embedded systems, or should I be considering other concentrations as well? Finally, if I do not get a Master's degree, should I just do another Bachelor's in Electrical Engineering? In any case, I've found it difficult to figure out how to navigate the process by myself, so I would appreciate any suggestions, help, and advice that you may have to share so as to figure out the best path to pursue. Thanks!