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John G. Fleissner

John Fleissner Obituary

FLEISSNER, JOHN G. 54, of Arvada. Viewing Monday 4-7 p.m. at the Aspen Mortuary Chapel, 6370 Union St., Arvada CO. Mass of Christian Burial 10 a.m. Tuesday, St. John of Arc Church, 12735 W. 58th Ave., Arvada CO.

To plant trees in memory, please visit the Sympathy Store.

Published by Denver Post on Jan. 19, 2004.

Memories and Condolences
for John Fleissner

23 Entries

Nancy Noecker

September 12, 2004

John was a good man and will be missed by all his family. He was such a strong ND fan, each time I go to the University I think of John. I know he was in heaven cheering yesterday (9/11/04) for the Irish win over Michigan!! Prayers continuing to be offered for John & his family.

With love,

Nancy, Lesley, Adam, Diana, Shaun & Connor

Always the Notre Dame Fan

February 9, 2004

Frank Lamb

February 5, 2004

John was both a good friend and a mentor for many years at Rocky Flats. I am grateful for the opportunities I had to work with him and will every be grateful for his teaching and support as well as fun-loving personality. One of his many acts of thoughtfulness was giving a gamma-ray spectroscopy course he developed for the Site Holdup Team. He kept me active in the ASTM and was always available to help. I miss him and send my heartfelt sympathy to his family.

Amy Marlowe

February 2, 2004

To Donna & Family:

My husband & I share your loss. I worked with John at Rocky Flats. He was a wonderful mentor for our group. Our Deepest sympathy.

January 27, 2004

John Fleissner & Family (JP, Karen and Mark) Christmas 2003

January 26, 2004

Helen Zgoda

January 24, 2004

I would like to extend my sympathy to John's family. I knew his parents and his family as my late husband, Leonard Zgoda, worked for Catholic Charities many years with them. May the Lord bless each and everyone of your family and give you the courage to continue with life's many blessings. Helen Zgoda

Deborah Jimenez

January 24, 2004

I'll miss his laugh.

Stephen Croft

January 22, 2004

I knew John by reputation long before I met him. Within the gamma spectroscopy and non-destructive assay community he ranked with the best in the world. It was with some trepidation therefore that ,as someone quite new to the field at that time, I arrived at his office to try and convince him to buy a Segmented Gamma Scanner from Harwell Instruments - an English outfit. We spent an enjoyable morning and had a delightful lunch in Boulder. When we parted I'm sure I'd learnt far more than him. He never did buy the system but he let us down with great aplomb.

A few years later, after John had joined Canberra and Canberra had bought Harwell Instruments, we became colleagues and friends. John was good fun to be with. He had a great sense of humour and was razor sharp. You could always have a good argument and a laugh at the same time. I liked him enormously and had the greatest respect for him. I will miss him as a mate to hang out with when on travel and also as a technical expert to bounce ideas off and root out problems.

He did have a great hat which he wore in his capacity as chair of our ASTM committee. What a lark it was the day when a group of us got carried away with youthful exuberance in the Man's Hat Shop in Alburquerque. I think the store keeper couldn't believe his luck. His business plan could not have possibily predicted that a gang of nuclear physicists, with more money than common sense, would wander by with John at the thick of it egging us all on.

Bob McElroy and I dined with John on the night before he died. We had a wonderful time and parted in high spirits. It was a great shock to learn the next morning that that would be the last such outing.

Thank you John and best wishes to your friends and family. You leave behind not only a fine hat but also some big shoes to fill!

Bill Rodenburg

January 22, 2004

To The Family

I too was shocked to hear that John had been taken at such an early age. He and I worked closely together at Mound for many years. He was one of a kind. He was brilliant, hard working, had a great memory and was fun to be around. His photographic memory always amazed me. How he could remember the details of a Notre Dame football game that happened ten years before was beyond me. I will remember him fondly and remember you all in my prayers.

Chris Oertel

January 21, 2004

To the family of John Fleissner:

No words can describe the shock and sadness at the loss of a good friend and a true professional. I had the honor of working very closely with John at Rocky Flats and spending a lot of fun time with John and his wonderful family.

He was a true friend and a mentor to many of us in the radiation measurements community. I will most remember him for his high standards of excellence and ethics.

Our prayers are will all of you.

Chris Oertel and family

Larry Bruckner

January 21, 2004

I was stunned when I heard of John's death. I knew him for quite a few years through ASTM and we often collaborated on standards. Even after my retirement from Los Alamos, we had a number of contacts on various standards.

He was a wonderful person professonally and personally. I sympathize with your loss.

Mike Zebarth

January 21, 2004

To John's Family,

You have my deepest sympathy. I was shocked to learn of John's passing. I first met him in the early 1980's as a customer of Canberra. I had the utmost respect for John as a scientist and considered him a friend. He will be missed.

Brent McGinnis

January 20, 2004

To John's Family and Friends:

I would like to express my deepest sympathies to John's family and friends. I met John only a couple of years ago at the ASTM meeting in Albuquerque, NM. John was an inspiration to me, not only as an expert in his field, but as a friend. John's technical knowledge, wisdom, and humor will be deeply missed. The few days that I have spent with John will forever be remembered as special times. My thoughts and prayers are with his family in these trying times.

Brent McGinnis

Nondestructive Assay Manager

Portsmouth Gaseous Diffusion Plant

Piketon, OH

David Bracken

January 20, 2004

To John's Family,

I have known John for 7 years through my involvement with the ASTM, during this time I have come to highly respect him professionally and considered him a friend personally. My thoughts are with you during this trying time. I am grateful for the time I was able to spend with him.

Richard Hagenauer

January 20, 2004

Karen and Mark,

I knew your dad professionally for 25 years. He was the best as far as being a friend, knowing his scientific field, organization, work ethic, and sense of humor. He was always soft spoken and tactful. I know that your dad's influence will be with you throughout your life. It certainly will be with mine. May God bless your life as it has your dad's.

Jeff Chapman

January 20, 2004

To John's Family:

My deepest sympathy to you and yours regarding the loss of a terrific man, John Fleissner.

He and I met at Rocky Flats in 1990 to work out the more interesting features of multiplet analysis. He then encouraged me and the rest of the active neutron ASTM bunch to dig deep and finish a standard that many thought couldn't be written. He was inspirational, a leader, and a comedian, all in the same guy.

I know he raised 3 great kids and supported them in all of their endeavors--the basement-level ping pong championships of 1994 come to my mind.

Because of John, I'm the proud owner of a hat that I never would have purchased otherwise.

I cherish the fond memories and times. My family and I grieve with you in his passing.

With Sympathy,

Jeff Chapman

Phyllis Russo

January 20, 2004

The loss of a single person to our professional community cannot be greater than the passing of John Fleissner. My deepest sympathies extend to all of John's family and friends.

Phyllis A. Russo

Safeguards Science & Technology Group, N-1

P.O. Box 1663, MS-E540

Los Alamos National Laboratory

Los Alamos, New Mexico 87545 USA

Mark Mount

January 20, 2004

I was deeply saddened to learn of John's passing. As a member of ASTM Subcommittee C26.10 on Non-Destructive Assay, I had the pleasure of knowing and working with John for several years. He will be remembered not just for his leadership and knowledge but also for his friendlieness and warmth. My deepest sympathy to his family.

Richard Mayer

January 20, 2004

I was deeply saddenned by John's passing. John and I worked together for over 20 years, and I always very much enjoyed his company, both professionally and personally. I will miss his guidance, expertise and wit. I pray that his family and friends find comfort and peace.

Jeff Adkins

January 20, 2004

As the Staff Manager for Committee C26 I had the pleasure of knowing John for the last three and a half years. I have many fond memories. My fondest memory is when John presented me with a case of "flat tires" at the June 2003 meeting in Denver. I had asked John about the availability of Fat Tire Beer (brewed in Colorado) prior to the meeting. Not being a native of Colorado, I may have said flat tire...so John presented me with a case of flat tires (bicycle innertubes)...These innertubes have been hanging in my office since June and will continue to do so, now with even more meaning...

Jeff Adkins

Staff Manager

ASTM Committee C26

Dick Blauvelt

January 20, 2004

John has been a friend and professional colleague since his days at the Mound Plant. He made tremendous contributions to ASTM Committee C26 and to the NDA field in general. His untimely death leaves a huge gap in his field but more importantly in our hearts. My thoughts and prayers are with his family today and in the days ahead.

Gary Smith

January 19, 2004

It is with deepest condolences that I send this note. I knew John for many years through Committee ASTM C26 on the Nuclear Fuel Cycle in which he chaired Subcommittee C26.10 on Non-Destructive Assay. John was a credit to C26 and the scientific community and he will be sorely missed.

Gary L. Smith, Ph.D.

ASTM C26 Chair

Pacific Northwest National Laboratory

P.O. Box 999, MSIN K6-24

Richland, WA 99352

(509) 371-8389

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