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BORN
03/29/1944
DIED
08/20/2025
Arnold Koonin Obituary
Arnold is survived by his beloved wife of 55 years, Gloria Koonin, his devoted children Adam (Karen) Koonin, and Andrea (Neal) Rosenthal, his cherished grandchildren Laura, Ryan, Caleb, and Reese, along with numerous nieces, nephews, and cousins.
A native Washingtonian and graduate of Woodrow Wilson High School. He received his undergraduate degree from Marquette University, and earned his law degree from Georgetown University. Arnie dedicated almost 40 years of his career as a respected tax attorney with PricewaterhouseCoopers before continuing to share his expertise as a financial advisor with Morgan Stanley for 20 years.
Whether he was at work or with family he was the problem solver, trusted advisor, revered mentor, and friend and confidante to all. He was an avid fan of Washington sports teams, a car enthusiast, and a lover of tennis. Above all, Arnie loved traveling the world with Gloria, and spending his summers basking in the sun with family and friends in Bethany Beach.
A funeral service will be held on Sunday August 24th at 10:30 am at Kol Shalom Synagogue, 9110 Darnestown Road, Rockville, MD 20850, followed by a graveside service at 12 p.m. at Judean Memorial Cemetery, 16225 Batchellors Forest Road, Olney, MD 20832. Shiva will take place at the Koonin residence Sunday, Monday, and Tuesday from 6 to 8 p.m. with minyan services 6:30 p.m.
Charitable donations in Arnie's honor can be made to St. Jude Children's Research Hospital and The Barker Foundation.
Services entrusted to Sagel Bloomfield Funeral Care.
To plant trees in memory, please visit the Sympathy Store.
Memories and Condolences
for Arnold Koonin
Terri and Steve Oram
August 25, 2025
So we got in bed last night reflecting on the magnificent, loving and oh so truthful feelings
Eloquently spoken by Gloria, Adam, Andrea and
Arnie´s devoted friends Steve, Joe and Marvin.
All of the feeling and love expressed was completely felt and understood by the legions of
Friends and family in attendance who had the blessing of knowing the one and only Arnie
Via business, friendship or family. Often business became friend and family.
Arnie always said "you can´t take it with you."
He meant you gotta enjoy life´s experiences and
Whatever "things" you could get enjoyment and pleasure from....But....what Arnie took with him and left as a legacy was all of the love and respect so very many felt for him. True treasures for a most wonderful man.
Arnie, we miss you so, but we shall have big smiles thinking of you and that´s exactly what you would want.
With much love, Terri and Steve
Gail and Robert Chrzan
August 24, 2025
What an incredible life and legacy he left behind.
Please accept our deepest condolences.
The world is a kinder place because of him.
Francis Day IV
August 24, 2025
Arnie was a great man and he will be missed. Please accept our sincere condolences. Michael Day, Maria Day, and the F.O. Day family.
jane katz
August 23, 2025
Arnie was so kind to my husband,Ron, who looked forward to the book group meetings. When my husband began to face health challenges, first not being able to drive at night, Arnie looked out for him to check if he needed a ride. From organizing meetings to hosting during Covid, when the group didn´t meet at a restaurant, Arnie made sure that the guys got together. This was a highlight for my husband who loved reading and the social interactions. Arnie, may your memory be a blessing.
Jane Katz
Jim and Gail Colen
August 23, 2025
Arnie was a brilliant accountant, a jokester and a problem solver. We lost him too early. He will be missed by so many who loved him dearly. May he RIP!! Jim and Gail
Ike Isaacson
August 23, 2025
Arnie was a very warm and kind person. He was always caring and loving to everyone. He will be missed greatly by all of us.
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