Forest,
My fiance will be making money eventually. Unfortunately, you make jack sheet as a surgical resident and they work you to the bone. 90+ hour work weeks.
I'll take your advice and sign up for the LSAT soon. I should have some time to prepare.
Any suggestions on what to use for LSAT preparation? Man, I'm studying more now than when I was an undergrad 
yeah, I know she'll be working like a slave before getting the big bucks. I was just teasing....
There are plenty of options in terms of LSAT preparation.
Personally, I just bought a couple books (Princeton Review and LSAT for Dummies) and a bunch of old tests from LSAC. The review books were really only useful in that they give you an idea of what you're getting into, as well as some tips on problem solving, etc. One of them would have sufficed.
The tests from LSAC are particularly useful. You can order them in groups of 10 (for the older tests) and individually by month of administration (for the more recently given tests). Visit their website (LSAC's- just google LSAC) and check it out. You'll become very familiar with this site and its services throughout the LS application process.
Personally, I didn't put much time into preparation. I had a lot going on at that time and literally began preparing the Monday before the test (which was on Saturday). I spent 3-5 hours each of those nights working through problems and taking practice tests. I did EVERY section timed. Whatever you do, definitely take several fully timed tests before going into the real one.
I was able to score in the 85 %ile, which I was happy with. I was confident that the score I got would get me into the schools I had applied to (and it did).
You'll need to do a self-assessment. Before doing anything or looking at anything, I took a full test, cold. Doing that allowed me to see what came easy for me and what didn't. I then focused on the latter.
If you want to stay in Boston and attend Harvard, then definitely put in more time than I did. For other Boston schools.... who knows- there is a huge range there. I think your experiences as a scientist will allow you to do fine. I do so much reading, writing, and analyzing as is, and that's the LSAT in a nutshell- reading and analyzing data given.
Good luck....