Luther and I participated in a simultaneous exhibition given by Grandmaster William Lombardy. This must be 1966, 1967 at the latest. The GM played about 30 games at once. Luther and I sat next to each other. We were both one leap above beginner, probably ratings of around 1200-1300.

I lost fairly quickly, folded up my set and watched Luther's game. He played a very tactical defense called the Two Knights. He was losing badly but had an attack against Lombardy's king. The result was inevitable - Luther would lose - but he was checking and sacrificing pieces with great gusto! Lombardy seemed less than amused...

Finally Luther ran out of checks and almost out of pieces and resigned. I told him he could have resigned several moves earlier. He said he knew that but, "How often do you get to check a grandmaster and throw pieces at him?!"

Drats. I wish I had known Luther better; that we had stayed connected. We were definitely kindred spirits, many mutual interests, outside-of-the-box thinkers and - at least at that time - outsiders. RIP, friend!

I met Luther at the Denver Chess Club. Besides chess we had a common interest in philosophy. Luther was studying the pre-socratics and sophists at the time, leaning towards the cynics! I was 17, I guess he was 15.

I drove out to his house in Aurora one Saturday to play chess and talk philosophy. He was 'home alone' and had scored a bottle of Gallo Hearty Burgundy wine. He poured a half-tumbler for me...then, he opened a bottle of Dr. Pepper and topped off the glass and said, "This will help it metabolize faster!" Luther was a natural explorer!

I met Karl & Susan when my first husband Knud and I moved to Austin in 1986. We met through a friend, Christina—whom I had just met myself. Our daughter Anna was 7 by then, and our son Robert was 6 months old.

We hit it off right away, with Karl, Susan, Christina, and her friend Matt. And a few months after we arrived, Eric was born! This was clearly a thrill for both Susan and Karl, who lavished him with love. And it gave us one more thing to share: the excitement of raising children.

Through Christina and Matt, we were also introduced to a whole group of people studying computer science, math, and the relatively new field of Artificial Intelligence. I think it was Matt who started a book club with his favorite people, and Karl & Susan were among them. I’ve been in several book clubs since then, but none of them share the brilliance of the discussions from that first book club, not least because of Karl & Susan’s contributions.

It was in the late 1980’s, in Austin, that Karl told me that I would love Boulder, Colorado. By then I was a single parent. I visited Boulder and loved it, but I chose to go back to California, where I had friends and family. I kept Karl’s thought in mind, however, and in 1999, I moved to Boulder. It has been as wonderful as I expected, and I thank Karl for this gift.

We have seen each other often over the years, not least in the summer, where they’ve come to Colorado to visit folks and hike in the mountains. Together with my husband Tim, we would hike together, admire the beautiful mountains, relish the flowers or wild animals that came our way, and then enjoy delicious dinners talking about everything under the sun.

As many have said, Karl always met us where we were and was interested in just about everything. Karl had a brilliant mind and was full of warmth and wit. It was always fun to be with him.

Our hearts go out to Susan, Eric, and Lipica, and to all his family and friends for this terrible loss.

My deep condolences to Karl's family.

I knew Karl for many years at MITRE. While we never actually worked together on a project, early on I learned of his deep expertise in shared technical interests and he became a frequent resource. The combination of his legal, scientific, and quantitative experience had given him a unique perspective on how human beings organize thought and argument. This is evident in his legacy at the company. Last year I co-hosted a work conference on advanced analytical techniques and I knew I had to include Karl as a panelist. I was honored by his participation.

Karl was compassionate and very generous with his time with me - both professionally and personally. He was truly an inspiration and I will miss him.

I cherish my childhood memories of when Karl would visit our grandmother, Grace Cline, during his summer visits to Clarksville, AR. I grew up in Clarksville, the town where my father, Jack Cline, was raised, along with his three sisters: Karl's mother, Bernice, Billie Cline Galloway, and Grace Cline BeCraft. Of the four Cline children, there were 10 cousins, four of us being born the same year, 1952. Although, over time, some moved away, we frequently managed to have fun, summer visits in Clarksville.

I vividly recall during one such visit, the elaborate chemistry set Karl had set up on the screened-in back porch of the two-story, white house, where our parents had been raised.  Although I don't recall the exact year, I believe we were about ten years of age.  Karl's chemistry set seemed huge to me at the time, and a bit scary, as I recall bubbling noises and steam rising from the tubes, as the mysterious liquid concoction moved gently throughout. It looked like something out of a "mad scientist" movie to me, but Karl was far from being a mad scientist. He had such a gentle, kind spirit behind that fascinating mind.  As kids, he was a joy to be around and never did I fear his presence, as was not always the case with young, rambunctious, boy cousins. He had thick, dark-blonde hair, beautiful blue eyes, and an infectious smile that just put you at ease.

I'm thankful for my kinship with Karl, and for knowing him as I did, back then. Although we stayed in touch these past few years, I selfishly regret not doing a better job of staying in touch beyond our childhood.

Rest in peace, my dear cousin. You were one-in-a-million.

Karl and I were classmates in the Computer Science department at UT Austin. In the years since then, my most prominent memories of my time there are the delight I took in enjoying the company of a group of brilliant and talented people. Karl and Susan were at the core of one of those groups that was especially important to me in my first few years there. It seems that I'll always remember some conversations with Karl. Reflecting back on those through the years since has served for me as an examplar of maturity, wisdom, and kindness.

I feel fortunate that I learned that Karl and Susan had moved to Maryland, not far from where I grew up. When I was back there for some time, I arranged to get together with them several times. What a great joy to discover that, after about 30 years, my connection and appreciation for Karl was just as I remembered!

I am ever grateful for Karl's presence in my life!