He was also a partner at Parker Auspitz Neesemann & Delehanty and Morrison & Foerster and an associate at Sullivan and Cromwell.
Parker was initially nominated to that court by President George W. Bush on May 9, 2001, to fill a seat vacated by Judge Ralph K. Winter, who assumed senior status on September 30, 2000.
[2] On July 9, 2019, Parker was part of a three-judge panel which ruled that President Donald Trump cannot block people from his Twitter account for being critical of him.
Writing for the panel, Parker said that the president uses his Twitter account to make official announcements and actions, so that responses to it are protected by the First Amendment.
The decision affirmed an earlier ruling by U.S. District Judge Naomi Reice Buchwald.