I was very fortunate to have known Fred. His enthusiasm for Botany and research greatly inspired me. I owe all that I have achieved in my academic life to Fred’s guidance and encouragement. Fred was kind, gentle, easy-going and jovial. He would often talk and share a laugh with us when he was in the lab. Fred loved to laugh, and his infectious laughter always brightened the lab, and energized our lab gatherings. Through Fred’s example I learned not only how a good scientist should be, but also what it meant to be a good person. Fred’s passing has saddened me deeply. I miss him greatly. I will always carry the memory of his kind, patient and gentle nature with me.

Fred was the best cousin anyone could ask for. Funny, smart, able to sing, told great jokes that he than would laugh at with you. I will do miss his phone calls. Thank you for making him a garden. Linda Thompson

It has truly been a pleasure to get to know Fred. He was a considerable and supportive adviser and friend for me. I will always remember Fred such as a warm, generous, funny, and lovely friend and mentor of my life. Here are some memory with him at Columbus OH. 1st one was taken on snowy day (Dec 22, 2004). 2nd and 3rd one were taken at Neela's home before moving to Vancouver (2006).

Prof. Sack was an enthusiastic and humorous person. As a real scientist he spent so much high quality time on writing, discussing and inspiring his students. As a supervisor his amazing and infectious laughter made every one in the lab feel warm and bright. He was also very considerate of other's situation and dis his best to help. I appreciate everything he have done for me and will miss him every day in my heart.

Fred was my first cousin that I very rarely saw because we lived in different states. He always made it his policy when he was anywhere near Phila or the PA turnpike to call and drop in to visit with us; and fill us in with what he was doing. When I saw that his botany experiment made it on the shuttle, I called him. He said all his friends and relatives were messaging him. He was a very sweet and dear person who was kind and considerate. ( He really did take after his parents in that respect.) I am so glad he visited us last year on his trip to PA. I will always remember him with love. My best wishes to Diane and the family. Audrey Marcus

Fred's course on developmental plant anatomy was the first I took as a new graduate student at Ohio State. He was an inspirational professor. On one exam I tried to draw plasmodesmata - it resembled lightening bolts or gnarly tree branches or something. He wrote "looks like Halloween." He will always stand out in my mind as one of the best botany professors I've ever studied with.

I just go through his paper, Structure and Development of Walls in Funaria Stomata, Amer. J. Bot. 70, 1019-1030". I was surprised with his knowledge on stomatal movement. How clear was his knowledge about stomatal movement. I have read the whole paper and take many notes. At last I look to the author and tried to find him. I see the sad news which hurt me a lot. Everybody will find him when he/she see a plant and think about it. Harun Rashid Akond, PhD

I never met Fred in person, but his papers and his incredible scientific thought were ever-present in my career as an undergraduate and graduate researcher. I worked on several mutants isolated in a tmm mutant background, and I think I must have memorized big chunks of all the tmm papers from Fred's lab! I always had a sense of him as a truly thoughtful scientist who investigated things carefully and thoroughly, with an eye for detail and an acceptance of (and curiosity about) phenotypes that were complex or contradictory. I also had the feeling that he was a very nice and considerate person, even though I never interacted with him directly. I was very sad to learn of his passing (much after the fact) and will always keep him and his work in my memory.