Robert Joseph Marshall

January 17, 1942April 9, 2017

Dr. Robert J. Marshall, PhD, CEO and founder of Premier Research Labs and Quantum Nutrition Labs, unexpectedly passed away on April 9, 2017 at age 75. Dr. Marshall touched the lives of many people all across the U.S. in many ways. As CEO, he oversaw the manufacturing of a comprehensive line of bioenergetically tested, premier quality nutritional and food supplements, distributed across the U.S. and worldwide, to natural health care practitioners as well as the general public. Since the 1980’s, he was the dynamic host of the popular radio talk show, HealthLine Live, a daily national broadcast where he answered live health and nutrition questions on the air.

He and his wife, Dr. Linda Forbes, were co-developers of the highly effective body analysis system, Quantum Reflex Analysis, which revolutionized the practice of many natural health care practitioners. In his own nutritional practice, Dr. Marshall used QRA as the key system to test and evaluate his clients. He was the lead presenter at many QRA Seminars held across the U.S. for many years as well as lecturing in numerous foreign countries. Individually, he personally mentored numerous practitioners over the years. He was invited to speak at many other conferences as well as other radio and TV shows.

Dr. Marshall lived his life to the fullest, delighting in helping individuals with their health issues wherever he went. He had a brilliant mind, was ever engaged in nutritional research and was a pioneer in advocating superior health practices. Recently, he and his wife set up the Nutrition Science Foundation, a non-profit organization, dedicated to ongoing nutritional research as well as researching and developing superior farming practices to use across the U.S. to teach farmers how to grow high quality food. His wife, Dr. Forbes, has taken on the role of CEO and will continue Dr. Marshall’s mission and legacy.

He is survived by his wife, Linda; his sister, Margaret Maryanne Marshall and her husband, Harold (Skip) Russell Paul, and their two children, Audrey Mercurio and Christopher Paul and grand-nephew, Dominic Mercurio; his daughter, Julie (Marshall) Simpson and her husband, Rick Simpson and their two daughters, Cassidy and Courtney; and his son, Jeff Marshall and his two children, KayLee and Jacob.

Dr. Marshall was pre-deceased by his father, Walter Priestly Marshall, his mother, Margaret Anne Theresa (Burke) Marshall, and his brother, Walter Frederick Marshall.

Funeral services will be held on Saturday, April 15, 2017 at 3:30 p.m. at Cook-Walden Funeral Home in Pflugerville, TX. In lieu of flowers, donations may be sent to the Nutrition Science Foundation, c/o Premier Research Labs, 3500B Wadley Place, Austin, TX 78728.

To share memories of Dr. Marshall with the family, please visit


  • Visitation

    Saturday, April 15, 2017

  • Funeral Service

    Saturday, April 15, 2017


Robert Joseph Marshall

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Robert Carwardine

December 18, 2020

My sincere condolences to Linda and the family. I was sad to discover today that Dr. Bob had passed away. Many years ago I was able to see Dr. Marshall at the Torrance, CA office. After following the program he put me on, my health improved greatly. After that, I never had the recurring tonsillitis and bronchitis that had plagued me for years. I'm very grateful. He was a great guy, and very encouraging. May God bless and guide you, Linda, as you continue the work.

- Rob

Rose Marie Centofanti

August 11, 2020

Just learned today 8/11/2020 that Dr. Marshall passed away! My mom who passed away 5 moths ago listened to him for many years. She introduced me to his radio show on Saturday mornings and we listened together for years! So sorry for your loss.

Leslie Machek

June 7, 2020

I just found out today that Dr. Marshall passed away. I still can't believe it. I think we all expected him to live at least to 100! I worked for him early on when he first came to the Austin area and was his client as well. His supplements improved my health dramatically and I had two healthy children at age 38 and 40. I learned so much from him in the short time I knew him. I was very sad to hear the news.

William Brent

April 20, 2020

We just became aware that Dr. Marshall passed away a few years ago. He was (is) a household name with us; we passionately refer to him as Dr. Bob. I haven’t told the kids yet, I will today; they are all grown-up and have their own families now. The four of them range in ages from 37 to 45, not babies, and we still share Dr. Bob’s products. Dr. Linda, we are Southerners who still us first names and we are so sorry for your loss, which is also a loss to this nation and different parts of the world. I once had the chance to let him know we refer to him as Dr. Bob, no disrespect, he chuckled… We will always love him.

Ron Prewitt

January 23, 2020

Thank you so much for awakening me to the world of nutrition & supplements. Sure miss hearing your radio show Dr Marshall .. I will chat with you in Heaven.. God Bless

Lolita Arquette

December 30, 2019

I am totally dismayed. Having moved to Arizona two years ago from California ,where I listen to Dr. Marshall every day at least every weekday, I begin online searching for times and radio stations here in Chino Valley Arizona when I came across a notation that Dr. Marshall had passed away. I was stunned. I was shocked. He was only a year older than I am now and being a health guru as he was I just can’t believe that he’s gone. I’ve taken his products for years. I had called into the show a few times over the years and he was wonderfully helpful. I often listen just to see how much he could help other people and he did so much. He should not have left this world too soon. I am so sad and I am so regretful that he’s gone but I thank him for all the years of information he gave out to so many. Hope to see him in paradise. 😥 thank you Dr Marshall

E Solomon

October 31, 2019

Dr. Marshall was well loved in my household while I was growing up. My dad was certain to have all of his family and friends listen in to Dr. Marshall’s radio program or at least try the products that Dr. Marshall sold. His products did my immediate and extended family a world of good!

Thank you, Dr. Marshall, for knowing and sharing the knowledge that we can all live healthier and ultimately happier lives. Thank you, to his family who shared him with the world. His memory will live on forever in my heart and mind.

Cynthia Christensen

August 9, 2019

Dr Robert Marshall saved my life. I am eternally grateful to him and Linda for their excellent work and dedication to optimal health care. My case was extremely difficult to diagnose, and I was given only a few months to live. But Dr. Bob was extremely knowledgeable, more so than any medical doctor I might add, in the field of understanding the biochemical pathways, and how to interpret and treat the illness in a totally natural way.

It is sad news indeed to learn of his death. His knowledge and excellence will be a great loss to the advancement of natural healing techniques.

I send the sincerest condolences to his wife.
With sincere appreciation for a brilliant man.

Cynthia Christensen, D.C.

Mary Saad

May 8, 2019

Dr. Robert Marshall was such a great man! I became familiar with Quantum Nutrition products while listening to KDAR on Saturday mornings. He was such an eloquent speaker and so knowledgeable about nutrition. Once I started ordering and using the products I was hooked. I immediately felt better. Everything he said was the truth and all my physical problems dissapeared and I felt great with so much energy! The Qdigest and Hcl with the activator revolutionized my life. No more acid reflux or gas. Bingo he really knew his stuff! I loved hearing his voice on the radio and he will be deeply missed! God Bless him and may he rest in Peace in God's paradise. Prayers for the family and everyone at QNLabs.


April 2, 2019

I was saddened to find out of Dr Marshall’s sudden death. Please accept my sincere condolences.

While home bound recuperating enjoyed listening to his live radio and podcasts . Hope products will continue to be available.

Looking forward to life as Psalms 37:29 when pain and death will be eradicated from the earth as Isaiah 25:8 and Revelation 21:4 reminds Bible readers.

You’re in my prayers.