After law school, Aaron was a Skadden Fellow in the Employment Law Unit of the Legal Aid Society, where he represented Chinese and other immigrants in a variety of employment and labor disputes. From 2013 to 2014, Aaron served as a law clerk to the Honorable Richard J. Sullivan of the United States District Court for the Southern District of New York.
The $474,000 court award obtained by Aaron and his colleagues at The Legal Aid Society after a jury trial in the Babi Nails Salon case (Song, et al v. 47 Old Country, Inc., et al., 09-Civ-5566 (E.D.N.Y.)) was mentioned in the New York Times article on labor conditions in New York's salons.
Aaron co-counseled with the Urban Justice Center to successfully represent Chinese restaurant workers in a federal court trial in 2016.
Sarah Maslin Nir, “Saying Court Win Helps, Nail Salon Workers Rally,” New York Times, April 10, 2012 (discussing the jury verdict obtained on behalf of Babi Nail workers by Aaron Halegua and The Legal Aid Society).