Is it possible take take part in a research project if I'm not a part of a university? I graduated with a Masters of Engineering, concentrating in digital signal processing, in particular medical and audio, almost two years ago. I've always been interested in research, but due to personal circumstances I could never commit a lot of time to working on a research project with a professor, and obviously didn't get a chance to publish anything. Now that I'm more settled and have much more time on my hands, I started getting involved in some open source projects and reading some technical literature (engineering, mathematics) that I couldn't get to before. However, I'd still like to find someone to to collaborate with on a research project who is already established in the field and publishes papers. Part of the reason I want to do that is to be able to eventually apply for a Ph.D. program in a good school, and having publications would be a great thing on my resume.

What I'm trying to find out is how I can work on a research project similar to those graduate students work on as a part of their studies if I'm not a student anymore? Should I contact my old professors from the university? Is it possible to find some "open research" team that accepts collaborators from outside? Do I have to do it on my own (quite frankly I'm not sure I can give myself a good enough quick-start)? In short, I'm willing to volunteer my time in exchange for a possibility of publication in the future. Can I do it, and if yes then how?
It's certainly possible, though admittedly somewhat harder outside the framework of a university. Some potential avenues, answering generally - not all of them might apply to your particular circumstance.


Academic/Business partnerships. These are a new hot topic, and in some fields quite active. Universities love them because they're a revenue stream. Businesses like them because its harder to get closer to the cutting edge than at a major university. Look for companies that do this as potential employers? They're good for both dabbling in research, and also as a springboard into the research side of things - I've met several "private sector refugees" in my time.
Research-oriented companies. Quintiles, RTI, Westat, RAND, etc. all come to mind. There are tons of these companies, and many of them both pay quite well and actively publish. Are there any that serve your particular field?
Consulting. Research groups occasionally have funding for outside contractors of one sort or another - and if someone really wants to work with you, they may write such a position into a grant with you in mind. For example, I have some grant support for a freelance programmer. I've known other people hired for a particular expertise, or just "a warm body who isn't a student". This is probably the path you'd end up going down if you both contact your ex-professors and want to get paid.
Volunteering. Academics are cheap. It never hurts to ask if they've got some side project you might be suited for collecting dust in the back.