Thank you for the Hyperbolic flow book and teaching in Dynamics seminars.

Thank you for the great book hyperbolic flows and instruction in Dynamics Seminars.

Todd was a very good, kind  person who treated everyone well.  I always enjoyed our conversations at conferences and mathematical meetings, most recently in Houston in May.  He was tremendously proud of his children and often spoke of their achievements.   I will miss him. My condolences and thoughts are with his family. 

Mary and kids, our hearts mourn with you and we want you to know we love you!

Todd was only ever Dr. Fisher to me (I'm still an undergrad at BYU), but he was one of my all-time favorite professors. I knew him as a brilliant teacher, but also as a great advisor and mentor—and during the year that I worked as a secretary in the math department, he went out of his way to learn my name and get to know me (allowing us to tease each other as Ohio State and Michigan fans do). I really looked up to him, and I'm so sorry to learn of his passing.

Todd was a hero of mine when I was a freshman and he was a senior in high school. He was so kind to me, it really boosted my confidence during those crazy teenage years. The pictures you all posted of him smiling are exactly the way I remember him, smiling and laughing. He is such a good person. I am so sorry for your loss. I lost my mother four months ago and the reality of the gift of the resurrection and eternal life with our families made possible through Jesus Christ became so much more real and important to me. Christ is the light and the life of the world. I pray your family will continue to turn to Him and trust in Him even more at this difficult time.

Dear Ellen

I am so saddened for you for the loss of your precious son.  He was the same age as one of mine and that is way too young.  What a shock that must be for you and your family and his family as well.  I am so sad for his wife and children.  I live in Bountiful Utah and would have come to the services on Friday but circumstances didn’t permit. I haven’t seen you for so long.  I pray that you can find peace and comfort in the hard days ahead through the knowledge we have that we will reunite with our lord ones again in almost glorious place.  I would love to see my sweet cousin again.  I have such sweet memories of our interactions so many years ago . My love and prayers are with you.

Rose Marie Bell LeCheminant

I sucked at Dr fishers class, but he was always kind to me in office hours. Watching his son give his tribute at the funeral was one of the bravest things I have ever seen. Rest In Peace dr fish, 🐐

Family! It meant everything to Todd. Although we were miles apart, and saw each other every few years, we would still embrace and enjoy the brief moments together.  My first real memory of Todd was when I was 9 and he was 7. I lived in Michigan with my Fisher cousins for six weeks. Although we were young, this time created a unique family bound. Todd's family would often make a trip to Utah when we could visit and continue our friendship. We were so happy when Todd and Mary moved to Utah! "Michigan Fisher's" were how we would identify them at Fisher gatherings. Todd's love for family, including extended family shined when he and Mary hosted the annual Christmas gathering of close to 100 Fisher cousins in Springville. We launched our new years goals into the cold night air. I loved the way he always talked about his children and helped them shine and perform, it truly is a trait of a Fisher father. We look forward to continuing our relationship with the Michigan -now Utah - Fishers. Families, extended families, truly are forever.  Love Shari Fisher Taylor

We are so saddened to learn of Todd's passing. We met Todd and Mary when we were graduate students; Todd was a PhD student at Northwestern and Mary was working in a lab at Northwestern Hospital. We remember having dinner at their apartment near St. Francis hospital and how Ross spent a New Year's Eve with them. The first thing that comes to mind about Todd is his great smile - you could not help but smile back. Todd was very intelligent and had interesting perspectives on many things. His thoughtfulness helped make us feel at home as within our ward. Years after Todd finished his education at Northwestern he and Ross reconnected through Ross's work in recruiting interns at BYU. Todd visited us in Chicago and Ross visited Todd's BYU office. Todd was a great host - taking him to the "swag closet" and offering a BYU Math t-shirt. In fact, one of the interns Ross recruited from BYU took a calculus course taught by Todd and he said Todd was one of his most favorite instructors. It's easy to imagine Todd as a great teacher. He is gone too soon, and we will miss him very much. Sending our love to all of his family, especially Mary and their four children.

- Ross and Emily Updegraff

I knew Todd through his teenage years via the Youth program in our church. He was 4 years (to the day) older than I but was always kind, thoughtful and cheerful. In fact, there isn't a single memory that I have of him in those years that doesn't include an ear-to-ear smile. He was the most well-rounded kid I knew in those years--he could do anything but boasted of nothing. He was an athlete, an academic and a musician. Wickedly brilliant but effortlessly cool. He had a strong testimony, which he demonstrated less by what he said and more by how he lived. I can only imagine that he grew in talent and testimony over time and I'm so grateful for the influence he had on my life during those early and impressionable years particularly for demonstrating that discipleship could fit so seamlessly into one's life. All my love and prayers for "the peace that surpasses all understanding" to the Fisher family.

The time Todd and I spent together at BYU is the most I have spent with any of my cousins on both sides of my family. Our mothers are identical twins and there was an instant connection. We went to BYU football games together, hiked Mt. Timp, spent holidays together, encouraged him as we started to date Mary, and many other experiences. My favorite memory is when we took Graph Theory together. He was a Math Major and I was Secondary Math Major and this was the only time our schedule allowed us to have a class together. The class only had 10-15 people in it and everyday he would read the newspaper during class. I would tell him everyday not to read it during class and he would just laugh and say, "I know you will let me know if I miss anything important!" We saw each other daily in the Math building and many times would sit and watch devotionals there or hang out in the lobby. I am so grateful for the memories I will always have of Todd.

We are deeply saddened by Todd's sudden passing.  What a gentle soul and a sweet human being.  We love the story of Todd as a boy saving to buy weights so that he could build his muscles to help with his dad.   Is there  a better story to illustrate the native goodness of this man?  I have a fond memory of taking Todd and Brent on a Stake outing to see a Tiger's game and then to Dieppe Park in Windsor Canada, where we had a picnic and played frisbee (perhaps hitting an elderly lady with a frisbee - ouch!).   That is where we saw the Hippie of Dieppe!   Our prayers are with Todd's family.

I remember the great joy Todd shared when the Cubs won the pennant after 70 years.  He was a happy, inspiring person.

The conclusion of our Late Summer Honors course on chance and probability — with Todd and Michael Call

Todd and I taught together for many years, first in the Late Summer Honors program, and most recently as part of the Honors Unexpected Connections courses. He and I relished the unusual interdisciplinary opportunity that this afforded us, creating courses that combined mathematics and the humanities (and driving our students crazy by requiring math homework as well as literature essays). He was a gifted and remarkable teacher, with a wide-ranging intellectual curiosity and an approachable classroom manner. Our students knew that he cared about them and they also felt his undeniable enthusiasm for the questions and topics we were discussing. Those discussions in the classroom would inevitably spill over into conversations as we walked back from the Maeser Building to our offices, and I am going to miss terribly those talks, whether about probability, chaos theory, or our shared love of Belgium (we both served LDS missions to Belgium in the 90s, but on opposite sides of the language divide). In many ways, I think in those classes Todd gave his students and me the tools to help us cope with his loss, showing how to find spiritual peace and meaning in the face of the vicissitudes of life. I am devastated by his parting, but find comfort in the thought of one day continuing those conversations about chance, determinism, and divine will. He was a good man and a good friend.

Dr. Todd had a great influence on my son' Davi Obata's life. We are from Brazil and they met during a congress over there. Since that, he was always motivating him in his career and studies in dynamic systems.  He was always kind and we would like to express our gratitude for all the support he gave to our son. 

May th Lord bless you all

Janete and Carlos Obata

I have met Todd in Brazil and also at several conferences abroad. We also enjoyed several hikes together. He was always very accessible and curious to discuss problems. I appreciate his math insights he shared with me and thankful for the texts he wrote. I will miss him as a very kind and enjoyable colleague. I feel really sorry that we have lost such a colleague so soon.

Todd has meant and done so much for me in the few short years I knew him that it's hard to imagine he's really gone. With the exception of my immediate family, he has had more of an impact on me than anyone else, and working with him has been the highlight of my education. More than a mentor, he was a friend with whom I always looked forward to talking and who perpetually inspired me. His loss will be felt deeply by students and friends alike. 

Todd was a wonderful person. I met him at various conferences over the years and he was always friendly and inquisitive, great company. We roomed together at a conference in Rio ten years ago, and he was an incredibly considerate and thoughtful roommate. Wherever we met, he was always up for a walk and a discussion about anything: from techniques in mathematical proofs to all aspects of life, always fun. I am glad to have known him. I send heartfelt condolences to his family, of whom he was so proud, and to his friends.

Todd was a good friend, loyal and kind, and always willing to help. Once in my PhD program I was struggling with a problem as I prepared for an exam the next day. In desperation, I emailed Todd for help. He quickly replied with the solution. I'm sure he had better things to do. My children still talk about our trip to Paris when we visited Todd and Mary. Todd was a gracious host, smart and very interesting. Todd, what a hole you have left with your passing!

Todd was a good friend and a great colleague. I know everyone in the BYU Math Department will miss him.

I considered Todd as one of my mentors and friend. He was so supportive of my career and always gave me so many good advices. He had a direct impact in what I do in my research and I was looking forward to working on new projects with him and learning from him. He was so generous, kind and fun. I will miss him a lot. All of my condolences to his family. 

I am very fortunate counting Todd as one of my coauthors. We wrote together three papers, I learnt a lot during this collaboration and he opened new perspectives. Thanks Todd. But much more important, beyond enjoyable mathematical collaboration, I also keep many nice memories. Specially enjoyable was my trip to Provo: the hiking with one of his sons in the mountains and a family dinner. Todd was a great host. He also visited Rio several times, with some dinners and hiking. He was always smiling and happy, with lots of positive energy. Also, he always was very generous. I will miss Todd and I have no words for these sad moments. I wish the best to his family and friends during this hard time.