So sad to learn of Dr. Mandel's passing. His wisdom, kindness, personality, and humor will be missed by so many. "Don't take any wooden nickels" was one of the ways he would end a phone call when we spoke. Lou was one of a kind.

I met Dr. Mandel editing his articles in a scientific journal, and we became friends. He spoiled my daughter and  was an absolute delight to know. We will miss him, his kindness, and his tic-tac-toe playing ability.

I remember as a student his strength in knowledge. 
I remember sitting in his classroom hoping he wouldn’t call on me with questions in an auditorium full of colleagues but I aways admired his teachings and listened closely.  Forever grateful.
One of your learned students

Dear Susan, Richard, Kara and David,
I am heartbroken to hear of Dr. Mandel's passing.  I cherish the time I spent with him.   He was an amazing professor and  a kind and wonderful person.  I learned so much from him and will miss him dearly.  You are all in my thoughts and prayers.

To the Mandel family,
Sending love, thoughts, and prayers to you and your family during this tough time.  I am so deeply sorry for your loss. Your father was a wonderful person who touched the lives of many. May you find strength and solace in the memories you shared together.
What an amazing person and what a remarkable life. I feel so lucky that I was able to meet Dr. Mandel.
Sincerely
Sabrina Williams (Renate's daughter)

Dr Mandel  was a great mentor and an amazing man. I still use the wisdom you gave me as a student and a resident. I still teach your wisdom to the residents I teach and your memory will live on forever. Thank you for believing in all of us who were your students and made us who we are and the people who we became. 

Reza Miremadi.

An incredible force for good. He affected so many students and faculty with his humanism, intelligence and great clinical insight.
He was as great as they come.
Kevin Heaney Columbia Dental '75

Dr. Mandel was one of those rare people whose brilliance was matched by his kindness and integrity. I was fortunate to work with him and co-author a paper together, and I’ll always admire the depth of his dedication - still teaching, engaged, and curious well past a century of life. He stood for admirable values long before they were common. I feel grateful to have worked with him and to have witnessed the example he set through a lifetime of excellence, professionalism, and humanity.

All my best,
David Walton, D.D.S.

I am so sorry to hear of Dr. Mandel’s passing. I spent a lot of quality time with him in the salivary gland clinic at Columbia. He was a very special and sweet man who I’m proud to have called my mentor. For better or worse he’s one of the main reasons I became an Oral Surgeon. After 20 years I still draw upon and teach what I learned from him to this day. My biggest condolences to his family. 

All my love,

Harrison Linsky, DDS, MD

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Louis Mandel

October 10, 1923 – November 4, 2025

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