So, TJ asked a really good question.  I apologize for not explaining this.  The PE exam is the Professional Engineering exam.  I am an Environmental Engineer; although my current position doesn't require it, it's good to have that license, as it will make it much easier for me should I ever want to switch jobs.  Although I like my current job, I'm not sure the opportunities for advancement are there, so it's a good option for me to keep open. 

The steps for licensure (OK, the most common steps) are as follows:

1. Graduate with a degree in an engineering discipline from an ABET (American Board of Engineering Technologies) accredited program.  This is why I spent 4 years at UMass getting my Master's- my bachelor's degree is in physics;  the M.S. program at UMass is one of the few accredited ones in the U.S., but it did mean that I had to take a lot of undergrad courses as well as complete my graduate work.  (Note:  Once, upon learning that I had been working on my Master's for 3 years (at that time) this guy in a bar who had been trying to pick me up said,  "Why?  Are you stupid?")
2. Take and pass the Fundamentals of Engineering Exam.
3. Apply for licensure as an Engineering Intern or Engineer in Training (that depends on the state) with the Engineering board of the state in which you took the FE.
4. Work under a licensed engineer for a set number of years (the number of years required varies).
5. Apply to sit for the PE.
6. Hopefully, pass PE. 

So, an alternate title for this post could be "Now that you all know what a geek I truly am, you will probably never come back."