A former adjunct professor at George Washington University Law School was disbarred by the Maryland Court of Appeals on Sept. 19 after pleading guilty to attempting to seduce minors on the Internet.

Richard Donald Lieberman was arrested in March following a sting operation conducted by agents with U.S. Immigration and Customs Enforcement. Lieberman was accused of e-mailing sexually explicit material to federal agents posing as 10- and 13-year-old girls in August 2010, according to a March report by The Washington Post.

Lieberman initially was charged with two counts of using a computer to seduce a child, two counts of receiving online statements for the purpose of sexual conduct with a child, one count of transmitting harmful material to minors and one count of lewd or lascivious battery.

On Aug. 9, Lieberman pleaded guilty to reduced charges of receiving computer statements for the purpose of sexual contact with a child, use of a computer to seduce a child and transmitting harmful material to a minor. He was sentenced to 15 years’ probation and must register as a sex offender. He agreed to stop practicing law as part of a plea deal.

Previously, Lieberman, 65, was a government contracts attorney with Washington firm McCarthy, Sweeney & Harkaway. He taught advocacy sporadically at George Washington, most recently in the fall of 2010.

He was a former deputy inspector general for the Department of Defense and for the U.S. Senate Appropriations Committee.

Karen Sloan can be contacted at ksloan@alm.com.