Leonce John "L.J." Sevin Jr. obituary, 1930-2015, Dallas, TX

In memory of

Leonce John "L.J." Sevin Jr.

1930 - 2015

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Jon de Mesquita

August 22, 2025

Never forgotten! Thank You L.J.

Kenneth Ervin Young

August 22, 2025

LJ hired me into Mostek in 1979 and later funded my first startup Cypress Semiconductor. He was a true mentor who will always be remembered.
Kenneth Ervin Young

KENNETH YOUNG

September 9, 2023

L.J. was a great leader, mentor and friend.

He hired me fresh out of Georgia Institute of Technology (Ga Tech) to work on new technologies in MPD2.

Later he financed our startup Cypress Semiconductor and many other technology companies.

My life would have been very different without him having touched my life.

He´ll always be remembered.

Kenneth Ervin Young
Tampa, FL

Tom Anderson

October 14, 2022

My condolences on your family's loss, in Mr. Sevin's passing. I've just received a copy of Mr. Sevin's excellent book, 'Field Effect Transistors' and can attest to it's quality, usefulness in the field, and his clear mastery of the topic. I hope he may somehow know, that his work is still greatly appreciated. Best wishes, T.A.

Jon de Mesquita

September 30, 2019

I would like the Sevin family to know that I feel very lucky to have worked at Mostek and I am honored to have known LJ. Memories of Mostek will always be among the best.

M Skanes

September 13, 2016

Sorry for the loss of a dear loved one. May you find comfort during this grieving moment. Psalm 105:4.

Krystal DB

September 12, 2016

For the friends and family of Mr Sevin, I am so very sorry for your loss. May the God of all comfort hear your heartbroken prayers and support you during these difficult times.

Tay McRaney

October 15, 2015

I worked for LJ in the 70s at Mostek and in the late 80s at Cyrix. As a salesman, I never worked for another CEO who treated his salesmen with more respect. He used a razor sharp wit to get and keep our attention. Our customers loved him. I think I can speak for all in sales who would say we truly enjoyed working for him and would do anything he asked. As a new Catholic convert I am glad to pray for the repose of LJ's soul and for comfort for his family and friends. LJ will be missed by us all.

September 30, 2015

Dear Jo: I was out of town and was unable to attend L. J.'s funeral. While we were not close during the past few years, we were during the early years of Mostek. The challenges during this time were many and required close cooperation and mutual respect and confidence. While we went our respective paths post Mostek, I continued to respect and admire his successes. I visited L. J. about a year ago and enjoyed the visit. Please let me know if I can ever be of help or assistance to you (and by that I don't' mean professional help as I retired from that several years ago). By the way Jo, I also have always had great respect for you and I wish you the best over the coming years. Respectfully, M. D. Sampels

September 30, 2015

Dear Jo. I was out of town and was unable to attend L. J.'s funeral.

Hewitt Gomez

September 26, 2015

Dear Jo and family: I am probably L. J's oldest friend. I am 90 now and was a neighbor and friend of L.J. since he was born. He & his brother Wallace filled my life with pleasant memories. My prayers are for you and your family.

Donald J. Redwine

September 25, 2015

My condolences to you and your family.

I worked for L.J. in 1968 at TI. and shared
a patent with him, on a capacitor pull up
shift register bit.
He always had a sense of humor, our office space was very crowded and the rumor was that every so often someone had to move their desk out into the hallway. L.J. took this to the extreme and placed a plastic urinal on the wall in his office to make it look like they had made him move his office into the restroom. I was a, green behind the ears
engineer, but L.J. made always made me feel at ease.
I am sad to hear of his passing.

Anita Parsons King

September 24, 2015

Jo,

My deepest condolences to you and your family at this time.

Jon de Mesquita

September 24, 2015

Thank you LJ, Mostek was my first real job.
My memories of the times there are fond indeed.

Mary Anne Potter

September 24, 2015

In the mid-1960s at TI, I was assigned to work for LJ. His project was to use the known instabilities of MIS (metal-insulator-silicon) transistors to make adaptive devices. I learned so much from him about MIS devices. I was privileged to work with him then and realized later how much these early experiences enhanced my own capabilities.

LJ, the design engineer who was supporting this project and I became part of the newly established MOS department in TI's Semiconductor Research & Development Labs. We were active in that department, along with many super people, until 1969. I moved to Houston with the MOS department; LJ did not move. At some point during or after the move to Houston, MOSTEK was formed.

In 1972, I hired in as manager of the first MOSTEK fab area in Carrollton. (The fab area I was managing in CA was making one of MOSTEK's popular designs as contract work.) I believe LJ had a lot to do with my receiving that offer. The next years were exciting ones for MOSTEK and for the Carrollton effort. LJ was truly a pioneer in IC development, especially MOS, AND in successful applications and products using MOS ICs. It was a privilege to know him and to work in organizations that he led.

I offer my sincere condolences and prayers for his family.

Robbie Hamilton

September 23, 2015

I will never forget Mr. Sevin and all the wonderful times I had with the whole Sevin clan. I grew up with this family, and cherish my memories. I've always had the upmost love and respect for each of them. RIP Mr. Sevin, you're with Annie now...

Kathy Truesdell

September 22, 2015

L.J. set the bar high for everyone who worked with him or for him. And we are better for having known him.
To paraphrase a Pogo strip, 'We met our hero and he was L.J.'

Kenneth Ervin Young

September 21, 2015

LJ was an incredible mentor to me and many others at Mostek and later for me when we started Cypress Semi. He was a great man and leader who helped so many of us grow further and faster than we thought possible. He will be missed by all of us whose lives he touched with such grace and wisdom.

Royce Zook

September 21, 2015

I will always be grateful for the Leadership and advice given me as a Mostek employee by Mr. L.J. Sevin. I had the privilege to work under his direction for 11+ years and learned very quickly that he was a most honorable man who really cared for those around him. Go with God and Rest In Peace.

Marion Territo

September 20, 2015

Jo, Chris & Family
So sorry for your loss. May God wrap his loving arms around you and provide you strength. Prayers for the family.

Jerry Jeansonne

September 18, 2015

Dear Jo,

I first knew L J when I was an undergraduate at LSU with L J as my instructor (that was quite the experience), then later as a fellow engineer at TI, and even later as my boss at Mostek. Throughout his extraordinary career and life L J contributed so much in so many ways to so many. He is remembered in his outbursts of frustration, easy humor, honest confrontation, and caring for every individual.

It is good to know that he is now at Peace still loving you and his family.

Jerry Jeansonne

Coyne Gibson

September 17, 2015

I had the good fortune of knowing L.J. during the formative years of my professional career, as a member of our Board of Directors at Convex, and throughout the later years as someone I worked with in the technology investment sector. I have always valued L.J.'s guidance and insight, and he is someone who left a lasting, positive mark on my life. He will be missed, and my condolences to the family and his many friends.

Ralph Dean

September 16, 2015

Jo and family,

God threw away the mold when he made L. J.

He and I both loved the comic strip "Pogo" and got much enjoyment from reading it.

L. J. was, shall we say, irascible, but underneath it all he was a soft touch. Although I hardly saw him anymore, I will miss him.

Ralph Dean, friend for 55 years

Dorothy Stephens

September 16, 2015

I worked for LJ as his Secretary in the MOS Dept. at Texas Instruments in late 60's/early 70's and knew him to be a caring, honest, dedicated, hard-working man who viewed his employees at part of a team, not just employees. To his family, I'm so sorry for your loss! Although I had not seen him for approximately 45 years, he will be missed, just knowing that he is gone.
Dorothy Stephens
Garland TX

Deanie Sevin

September 16, 2015

Dear Jo and Family, I'm sorry I will not be able to attend L.J.'s funeral, but know that my prayers and thoughts are with all of you. Deanie

September 16, 2015

Steve and I will always be grateful for knowing L.J. He mentored and guided Steve well. His generous spirit and wise experience benefitted so many. He will be remembered and respected with much fondness. Our condolences to his family. Samra and Steve Wallach

Tut & Barbara Rhodes

September 16, 2015

Dear Jo, Paula, Gordon, Chris and families. Tut and I were so sorry to hear of L.J.'s passing. I have fond memories of him when we were young in Baton Rouge when I spent summers at my grandparent's home. Tut and I send our deepest sympathy to all of you. Barbara

Charlotte McNamara

September 16, 2015

Our thoughts and prayers are with you and your family, Jo, during this difficult time. LJ was always such a gentleman and we appreciate all that he and you did to make The Bluffs a beautiful place. Charlotte and Cary

Mr & Mrs Tom Crouse

September 15, 2015

Our love & prayers are with you and your family, Jo. L.J. was a fine man and it was an honor to be a neighbor here at the Bluffs. God bless. Helen & Tom

Legacy Remembers

Posted events

September 16, 2015

Sep

26

Visitation

10:00 a.m.

All Saints Catholic Church

5231 Meadowcreek Drive, Dallas, TX 70821-0588

Sep

26

Funeral Mass

11:00 a.m.

All Saints Catholic Church

5231 Meadowcreek Drive, Dallas, TX 70821-0588

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