George Halfkenny wrote a letter of recognition for Sushree Nayak for her contributions to the U.S. Bank ACA Project. He praised her for immediately making meaningful contributions, demonstrating ability to handle technical challenges, dedication to timely delivery, and for being a great team player with strong communication, mobile development, and secure coding skills. He was also pleased that she embraced additional responsibilities like CSS coding and build management beyond her initial focus on secure coding for iOS.