I've had three scholarly articles published, all in 2012. The first one was the most influential piece by far, and started the law school transparency movement. It had a few thousand downloads on SSRN. Despite this, nobody accepted it while I was in school. (We published it spring 2L on SSRN and started a press onslaught). We submitted it to maybe 50 journals and law reviews. The issue was that we were students. Tons of press around our piece...and it didn't matter.
Finally, I received an email down the road. Somebody read it from Pace Law Review and asked for us to submit it. Within a week it was accepted. Ended up re-writing it because so much had changed in the time elapsed. It was finally published over two years after the initial coverage.
The other two pieces were by invitation. The Michigan Journal of Law Reform asked me to write a companion piece to another journal article. The other was the Journal of Law (Journal of Legal Metrics). It's online-only and the review process was different. They approached me because they liked LST's data analysis. It's a new-agey journal and the absolute best place for what we wrote -- the methodology and justification for the LST Score Reports.
I have another piece coming out in about a month, though I just started it today. It's with the Nebraska Law Review for the online publication. They also asked me to write.
Personally, I'm only going to write scholarly pieces when asked. I submitted another piece to about twenty journals that may or may not have been fit for publication (the Winter Index Report is available on my SSRN page:
http://papers.ssrn.com/sol3/cf_dev/AbsB ... id=1408251). Nobody interested. For me, the credential is nice, but I'm able to influence more through other writing. Sometimes it's the only place that's appropriate, though. (Example: the MJLR piece.)
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Let me add one thing. I find writing is the best way for me to collect my thoughts. It forces me to organize and communicate as well as possible. My trouble is that writing takes me for-ev-er. I operate best on deadlines, and I have very few real deadlines.
It makes me a better advocate, and it helps certain people take me more seriously. You have to have a reason behind writing it or else it's just not worth it. It's a lot of effort. And your piece has to be particularly polished to get accepted before you're a professor.
I would also say that, when you write, actually try to contribute to the body of knowledge. If you can't think of a way you can contribute, don't write it. Do something else with your time.
And now that I'm just writing all of the thoughts that come to mind, writing guest blog posts is a good outlet for contributing and practicing writing. I take a very academic approach to columns, whether on a news site or on blogs. I try to liven it up a bit, but that's just not me.