I'm a medical doctor as well, working as a software engineer at a medical startup. I switched from medicine to software engineering more than ten years ago. Bas

I'm a medical doctor as well, working as a software engineer at a medical startup. I switched from medicine to software engineering more than ten years ago. Basically, what I did to make the switch was to follow courses, did a lot of reading, and a lot of programming. Not too long after that, I got my first job as a programmer. From then on I learned mostly on the job. I'm now at my fifth tech job after switching. Like others have commented, there are companies that will hire doctors for non-medical positions, I know quite a few doctors that ended up in non-medical jobs. If marketing is what you'd like to do, I'd say try to find a position that enables you to grow into that, while learning on the side, and take it from there.