 In 2013, Kassinger was a signatory to an amicus curiae brief submitted to the Supreme Court of the United States in support of same-sex marriage during the Hollingsworth v. Perry case.In 2015, Kassinger was named the Law360's International Trade MVP by helping to obtain crucial government clearance on massive technology deals for IBM Corp. and securing a landmark exception to the U.S. government's nearly 40-year-old ban on crude oil exports.Kassinger has been named a Top National Security Lawyer in DC by the "Washingtonian" Magazine annually, from 2011 to 2015.