A lawyer who writes a popular blog about attorney discipline was sued for defamation Tuesday by an attorney featured in a series of critical blog posts.

The lawsuit was filed against Michael Frisch, adjunct professor and ethics counsel at Georgetown University Law Center, who is also the primary author of the Legal Profession Blog, which highlights attorney discipline cases across the country. The plaintiff in the suit brought in the U.S. District Court for the District of Columbia is attorney John Paul Szymkowicz, who also named Law Professor Blogs LLC, a blogging network owned by Paul Caron, dean of Pepperdine University Rick J. Caruso School of Law. Frisch’s Legal Profession Blog is a member of Law Professor Blogs.