On May 14, 2025, the world lost a kind and loving soul, John James Isitt, at the age of 70. He was born on July 9, 1954 in Fullerton, to Marie and John Isitt. He lived in Diamond Bar and Thousand Oaks before retiring with his wife to Ramona. John was a 1972 graduate of San Pedro High School. California became his true north. He was enchanted by its allure and embraced every aspect of life here, choosing to remain and create a life filled with joy and contentment. John married his wife, Hanna, at Calamigos Ranch in Malibu, California. Together, they shared a life full of adventure and love.

John had a lifelong love for knowledge. He pursued higher education and later returned to teach Biology as an esteemed alumni at Cal State Long Beach. He was a Health Economics & Outcomes Research (HEOR) professional with over thirty years experience in Biotech/Pharma, healthcare management, observational research, and medical research developing and executing strategic evidence generation plans with clinical trial and real world data, demonstrating product value for access and reimbursement. His sharp problem-solving skills and attention to detail earned him respect in every endeavor he took on.

More than anything, John was a man of adventure. He had an infectious love for life, travel, and exploration, embracing the world both near and far. He raced motocross in his youth. Later in life, his love for motorcycles was a cherished bond he shared with his son, Michael. Whether traveling internationally or enjoying the simplicity of a quiet day with his family, John's spirit was one of boundless enthusiasm and warmth.

John is survived by his wife, Hanna; son, Michael Isitt; sister, Sara Colmery; brothers, James Isitt and Benjamin Isitt; nieces, Gina Bosotina and Lisa Colmery; and grandchildren, Emily and Joshua. He was preceded in death by his parents, Marie and John Isitt; and his son, John Isitt.

John will be remembered for his warmth, generosity, and unwavering dedication to his family and friends. He had a heart of gold and a spirit that could light up any room. His memory will live on in the hearts of those who knew and loved him.

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Published by Times of San Diego from Jun. 4 to Jun. 6, 2025.

Memories and Condolences
for John Isitt

Sponsored by Bonham Brothers & Stewart Mortuary.

6 Entries

Hanna Isitt

October 10, 2025

John loved his Scrub Jays , he wrote a book on `The Evolution of the Scrub Jay in the Western United States ` California State University, Long Beach in May 1989

Hanna Isitt

October 7, 2025

And even if you say goodbye,
You will never go away
You are my colors in the grey
And even if you say goodbye
You always be around
To lift me up and take me high
Keep my feet close to the ground
Are you proud of me today?
I chose the light
Nothing to lose if I lose you
New day will rise, life will go on
Everyone cries, don´t cry alone
Darkness will fade, pain will go by,
But we will stay, even if you say goodbye,
And even if you say goodbye, you will never leave,
And my only wish, a ray of light in my day,
New day will rise, life will go on,
But you will stay, love of my life

By Yuval Raphael -
Israel October 7 survivor

Jennifer Isitt

October 4, 2025

His son is having a celebration of life to join in remembering the wonderful life of John James Isitt on December 14, 2025

James A Isitt

June 5, 2025

I was so blessed to have a careing brother like John he took me under his wing when our parents passed away when we were young and I will never forget the fun times we had growing up doing spots together Love you and miss you bro

Nathan Samples

June 5, 2025

Whoa, this is truly shocking, me, John and Trent used to get up to some high old times back in the day, I can't think of a cat who was more alive than John was back in the day, I am decimated by this news.