The following “judicial profile” was published in the March 2016 issue of The Federal Lawyer, about six months before Judge Duffy retired. Writing it was both a labor of love and a project that I somewhat blindly committed to, without realizing the enormity of it. At that time, Judge Duffy had been a U.S. District Judge for more than forty-three years, and I had known him for more than twenty years. He was my mentor and beloved friend. The difficult part of writing the article was deciding what to omit. His contributions in service to our nation were too numerous to catalog. My goal, therefore, was to give the reader at least a glimpse at his extraordinary public service, and more importantly, a sense of his character. It is a eulogy. I’m grateful that I was able to share it with him while he was on the bench.