Dr. O, that is what I called him…..not because I couldn’t pronounce his name but because we were friends. I first met him in 2011 while working at San Diego Imaging. He was a special kind of person because it took him a while to get used to me . He had a feisty personality and was very direct but underneath it all he was a wonderful person who had a lot to share . As time went by I got to know him more. We became friends and he became one of my greatest mentors. Each time he walked through the doors of SDI he greeted me with, “Hi super lady!” Or “Here comes trouble !” 
He always told me that I had a lot of potential and with that, I could do anything . He saw the best in me, even when I didn’t see it . He guided me to look for better job opportunities and gave me advice for job interviews. He played a major part in my life and for that I am thankful. I’m glad that I had the opportunity to meet him and know him for many years. My condolences to his family. Rest in peace Dr. O, you are truly missed.

Bill was a mentor of mine as I came out of the military and entered the civilian practice of EM. 
He was a real fireball with boundless energy. He was a dynamic leader and eventual medical staff President for Paradise Valley Hospital, an expert witness as well as a clinical investigator for phase 3 drug trials. I am most grateful for the exposure to all three of these areas. His stressing the importance of being involved in hospital leadership and participation in organized medicine on a national level, provided the impetus I needed to eventually go on to become President of our national specialty organization (AAEM).  Bill was a true friend and helped me through some difficult times in my career. I will always be grateful for all he taught me and did for me.  RIP friend.

Trident Society

William O'Riordan

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OBITUARY

William Dabney O'Riordan

June 7, 1940 – June 7, 2025

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