Greetings, Sprig, and welcome. You wrote:

<<It has always been my understanding that an individual can contribute to a ROTH IRA even if they also contribute to an employee sponsored retirement plan (403 B in my case). A fellow employee informed me that this is not the case. I believe that I am correct, but a confirmation would be nice. >>

Consider it confirmed. You are correct and your co-worker is not. As long as you meet the AGI limits for doing so, you may contribute to a Roth. And even if you didn't, you could still contribute to a nondeductible IRA regardless of your income. For details, see the IRA discussion in my Foolish Retirement Plan Primer at http://www.fool.com/retirement .

Regards...Pixy