Well he didn’t practice law while in DC
“Khan spent seven years, from 2000 to 2007, in the Washington, D.C., office of then-Hogan & Hartson. He served as the firm’s manager of litigation technology. Although he did not practice law while at Hogan, Khan was well versed in understanding the American courts system. On Thursday night, he described his late son dreaming of becoming a military lawyer.”
http://www.law.com/sites/almstaff/2016/07/29/dnc-speaker-khizr-khan-a-man-of-character-say-former-big-law-colleagues/?slreturn=20160702140609
Registration Number: 4846283
KHIZR MUAZZAM KHAN
KM KHAN LAW OFFICE
415 MADISON AVE
NEW YORK, NY 10017-1111
United States
(New York County)
(202) 279-0806
E-mail Address: KMKHAN@KMKHANLAW.COM
Year Admitted in NY: 2010
Appellate Division
Department of Admission: 3
Law School: HARVARD LAW SCHOOL (LL.M.)
Registration Status: Currently registered
Next Registration: May 2018
Disciplinary History: No record of public discipline