Like many of you, I have so many fond memories of the friendship and brilliance of Bob. When I arrived at the ANU in 72, Bob was my lifeline to understanding tokamak physics. And I used him. I would take experimental data to him (a theorist, no less), and he would have impressive insight. I recall when we were mapping runaway electron drift surfaces that I brought the data to him and he recognized that the runaways were experiencing a diffusion. He immediately wrote out an equation which later became known as the magnetic diffusion coefficient when it was reinvented by Rechester and Rosenbluth. All that R&R did was insert the electron thermal velocity for "c" which Bob used for the speed of the runaways. R&R referenced the LT-3 work in their early drafts but not in the final PRL, so Bob received no credit for his brilliance. Typical of the Bob that I knew, he was unperturbed by that turn of events. He seemed to be without an ego.

One year, Margo and Bob with my family rented a house boat and travelled the Murray River in South Australia. We would stop at vineyards along the way and purchase a bottle or two (or case) and then sample them at night. Bob liked red wines that had high tannin content and he would say "This is a good rough red!". The translation from theorist jargon to English is that the red was "UNdrinkable".

I wanted to express my sincere gratitude to Bob. He not only introduced me to the fascinating world of plasma physics, highlighting some of its most intriguing problems, but also provided continued support and guidance. Thanks to him, my visits at ANU were not only enjoyable but also invaluable learning experiences. He was a true gentleman and a brilliant physicist, and I will always be grateful for his influence.

I met Bob at Princeton in 1977. I was a first-year graduate student then. I had Jim Strachan, who was once at ANU, as my first-year advisor on an experimental project. He was fun to work for but persuaded me that I was a better theorist than an experimentalist. So, I ended up in the Princeton Plasma Physics Laboratory Theory Department. For my PhD thesis, I went around talking to several people. Bob impressed me the most---there was an elegance and depth to his thinking that stirred and inspired me throughout the 45 years I had known him. He was truly original in everything he did, even pursuing ideas that did not always work out after years of hard work. I marveled at his ability to hold a problem in his head for decades, chipping away at it relentlessly. He was single-minded, confident in his technical skills, and playful with physics.
Bob was not a traditional mentor. He was profoundly generous but did not write hyperbolic recommendation letters for his students or brazenly promote them. He never practiced self-promotion and was genuinely humble. He led by example. People who knew him knew how good he was and trusted his judgment. It was a badge of honor to be his student.
He was gentle, soft-spoken, and sincere in his affection and warmth. He was self-deprecating and had a mischievous sense of humor, which rubbed off on some of us.
I have many stories to tell and many unfinished conversations with him. The world has lost a great theoretical plasma physicist and human being. I have lost my hero, my teacher, and a dear friend.

I am very sorry to learn of Bob's deatrh, I share the grief of the community, and present my condolences to his family and relations.
I met Bob on the first night of a recent conference on Plasma Physics in Nagoya, Japan, as he was walking in the streets. We spent several quiet and delightful hours, over the next few days, between the streets, trains and restaurants, discussing his hiking adventures and a wide range of life topics. He also was very supportive of my colleagues' and my current project, without judging the work itself, and was generous with his advice. Since Nagoya, he sent me a couple of friendly and supportive messages too, which I much appreciated. I certainly understand that he would have been a mentor and father figure to generations of scientists.
In some cultures in the Far East, departed people remain with us and continue to be discussed in the present tense. Having met him and shared these few moments with him will help me be part of the community that continues to celebrate his life and contributions.

It is my deep regret to hear the news that Dewar-san passed away. It is needless to say on his huge contributions on evolution of plasma physics. I would emphasize here his gentle and friendly nature, which I have felt since the first meeting with him.
I sincerely wish his soul rests in peace, and I am also sure his friendly smile keeps living in our mind.