Thomas A. MacCarthy

thomas maccarthy

June 2, 1970 ~ November 3, 2023

Born in: Wimbledon, England
Resided in: East Setauket, New York

Thomas A. MacCarthy was born June 2nd, 1970 in Wimbledon, England to Guadalupe and Gerald MacCarthy. He resided in East Setauket with his loving wife, Alejandra Alvarez-Morales. Thomas was a loving father to Gabriel and Lucia and he was a caring brother to John Philip and his wife Cristina. He is missed by his beloved aunts and uncles John, Mary, Annie and Tom and all his cousins. He was very loved by his mother-in-law, Miriam Morales, and Brother-in-law Carlos Alvarez and his wife Carla and by his nephews Claudio and Gonzalo. He is missed by his uncle John and his cousin Jane. He was a dedicated and loved professor at Stony Brook University that has touched many lives. Thomas passed away on November 3rd, 2023 in East Setauket, NY.

A memorial visitation will be held on Friday November 10th, 2023 at Branch Funeral Home of Smithtown and a Mass will be held Saturday November 11th, 2023 at 10:45 AM at St. James R. C. Church in Setauket, NY.

To view livestream for Mass, please click the link below:

In Lieu of Flowers, Family Requests all Donations to be made:

To the charity link below to the Nassau Suffolk Autism Society of America in honor of Thomas MacCarthy.


Broadcast Date:

Branch Funeral Homes Broadcast


Visitation: November 10, 2023 2:00 pm - 4:00 pm

Branch Funeral Home Smithtown
190 E. Main St.

Visitation: November 10, 2023 7:00 pm - 9:00 pm

Branch Funeral Home Smithtown
190 E. Main St.

Mass: November 11, 2023 10:45 am

St. James R. C. Church, Setauket
Route 25 A & Ridgeway Ave,

View current weather.


The family greatly appreciates donations made to these charities in Thomas A. MacCarthy 's name.

Nassau Suffolk Autism Society of America

Memories Timeline


  1. I was fortunate to have Professor MacCarthy as an instructor for my courses. He was incredibly kind and supportive, offering me help whenever I asked. I am heartbroken to have heard of his sudden passing, and I send my deepest sympathy to his family.

  2. Tom was simply the nicest guy you could ever imagine having as a colleague. His expertise spanned areas of computational and statistical modeling in biology, particularly in immunology, evolutionary systems, and, most recently, computational virology. He has been a beloved colleague, teacher, and mentor to a diverse set of students, at all levels, from high school, through undergraduate and PhD. Tom never turned down an opportunity to serve the campus and never backed down from a challenge. He will be sorely missed.

  3. I was extremely fortunate to have Tom as a professor in undergrad and then again as a grad student. His classes were fascinating and amazingly taught. I looked forward to every class. I was even more fortunate to have him as an advisor and mentor when I joined his research team studying Pancreatic cancer. In the few short months we worked together, we accomplished a tremendous amount and I learned so much from him that I will never forget. He undoubtedly impacted my future academic and life path for the better. I couldn’t be more thankful for his influence. On our drive down to Boston for a conference we talked about everything, and throughout it all the deep pride he had for his students’ research and his everlasting love for his family was exceptionally apparent in all the best ways. His amazing guidance, exceptional teaching, and overall good-naturedness will be greatly missed. My heartfelt condolences to his family.

  4. candleDear Thomas, may you rest in peace and thank you for always being such an inspiration. Since I was a child I looked up to you and everything you had achieved. I will never forget you putting tobasco sauce on your marmite on toast when you visited us in Wales when I was little! Love and best wishes to your family, Lupe, Jack, Ale, Gabriel and Lucia. I will be so sorry to miss your service but will think of you. May you always be remembered for the intelligent and kind hearted man that you were. Lots of love from your cousin Nia & Jacob-Conor xxx

  5. candleMy heart is broken. I met Tom through his brother Jack when we were 21. We backpack in Europe and was an absolute pleasure. It was like traveling with a living encyclopedia. Then we met again in NY, he told me he was Asperger and everything made sense then. It was a total pleasure to meet you Tom, I feel fortunate to have met you and your lovely wife, Alejandra (mi loquis) and your kids, which my heart is with them.

  6. Victor y yo te acompañamos en tu pesar. Que Dios lo reciba en su santa gloria y que tu hijo descanse en paz. Nuestras oraciones para ustedes que lo recordarán siempre y que les hará una enorme falta en su vida.

  7. Professor MacCarthy was teaching a class I’m currently taking and I remember him saying just this past Thursday that we’ll be meeting on Zoom next week since he’ll be traveling. His sudden passing has really shocked me and left me heartbroken. He was a very knowledgable professor and devoted his time to every student. Though I only knew him for two months, he really left a strong impact on me. My condolences to his family and friends.

  8. candleBendiciones mi querida Alejandra y familia. Recuerdo a Thomas de la secundaria como una persona tranquila, gentil y noble. Su familia ha dejado huella en mi ser y no dudo que Thomas lo haya hecho con tantas otras personas. Mismas sinceras condolencias y les envío un gran abrazo.

  9. candleI am heartbroken. Tom was a wonderful colleague and close collaborator. We were looking forward to making so many more discoveries together. I will miss you Tom.

  10. I knew his late father better than Thomas as I was a student of the Lancaster school in Mexico city. But I am still devastated to hear of such a loss it just to his family and friends, but also to anyone that met him. May he rest in peace

  11. I am so very sorry to hear of Tom’s passing. I only got to spend some time with him on a few occasions over the years but each one was a real treat. Tom struck me as one of those rare people who are instantly and completely likeable – so much so it’s almost impossible to imagine someone meeting him and not liking him. He was kind, he was generous, he was great fun and he wore his considerable intelligence lightly. Myself, Mairead and Sadhbh got to spend Easter Sunday of last year at the house in Long Island with Tom, Ale, Gabriel and Lucia, and we will now always remember that wonderful day of terrific Mexican food and great conversation with much fondness. Deepest condolences to Ale, to Gabriel and Lucia, and to all the other MacCarthys. We are sorry to be missing the services but will be sending love from Dublin xxx

  12. candleAle y familia, reciban un fuerte abrazo y mucha fortaleza. Espero que los magníficos recuerdos que tienen de Tomás last forever. Know that you are not alone. XOXOXO

  13. candleThankful for being touch at some point of my life by the McCarthy Familiy. My thoughts and prays with Tom’s relatives.

  14. I am very shocked and saddened to hear about Tom’s sudden passing. He is gone way too soon. As the graduate program coordinator for Applied Mathematics and Statistics, I work closely with many of our faculty. He was always so kind and professional and a pleasure to work with. He will be greatly missed. My condolences to his family, friends and colleagues.

  15. Tom was a thoughtful and kind colleague, a resourceful and intelligent collaborator, and in the couple of years we worked together, I felt we were becoming friends. I will miss him as colleague, collaborator and friend, and my thoughts are with his family and those he mentored. He is sorely missed.

  16. Mi mas sincero pesame a la familia McCarthy. Tom fue un gran colega y una gran persona. Descansa en paz, Tom.

  17. It’s hard to even articulate how saddened and shocked I am to hear this. He was one of the first professors I interacted with at Stony Brook and I honestly don’t know if I would be on the same research trajectory without him. My time in his courses (ALL of his courses) as an undergrad and fledgling grad student feel almost like a past life, but I can still distinctly remember his smile and enthusiasm (whether for biology or programming logic gates in the early days of Minecraft). I will miss him dearly.

  18. candleWe are heart-broken to hear this sad news.
    Tom is such a wonderful person and colleague.
    We will miss him very much ……
    To all the loved ones of Tom:
    Please take good care of yourselves ……

  19. Dear Tom’s family and friends,

    I am a colleague from Canada who collaborated with Tom on several projects. We collaborated quite closely in the last 4 years and I got to know Tom as a very capable and smart researcher, but also the most generous and kind person I could ever hope to work with. Through Tom I met many other colleagues who have enriched my work. I have no words to express how enriched he made my professional life, and how his kindness and generosity impacted me in my personal life. I will miss my dear colleague, collaborator, and friend, and I wish him all the best in the next phases of the journey till we meet again!

  20. candleSleep in tranquility dear Thomas. Thank you for your warm smile and company, and delicious Friday night pizza! Whether we exchanged a few niceties on the trail or at your home, I thank you for your kindness. May Alejandra, Gabriel and Lucia be comforted with lots of love and peace. ❤️🙏

  21. candleEverything that transcends completes a cycle, a person completes a life, a book concludes a story, a melody has it’s ecstasy and its closure, a place fulfills its time. Everything oerforms the necessary time to touch hearts and tattoo memories in people.

    Tomas touched many hearts, in his own way and at his time. We are certainly going to miss him.

    Godspeed, dear Tomas.

  22. candleI met Thomas – “Tomas” for us – around three decades ago, when he started dating Alejandra. His head was full of science dreams while his heart was my sister’s. With their unbendable determination they sailed far away and formed a beautiful family and precious friendships wherever they went. Our not-very-frequent encounters were always fulfilling. Everything he did was sincere. Substance was an absolute priority over forms all the time. He was a fantastic and loving husband, father and uncle. I will always treasure his candor; delicious cooking; his casual teachings, (which were usually more about life than science); his sharp sense of humor; and the love of a brother that was pure and built with his perseverance, as in everything he did.

  23. Querido Tomás, desde que te conocí, siempre me pareciste un tipazo, y me pareció lo máximo que salieras con mi mejor amiga. Cultivaste en todos nosotros tu amistad con cultura y buen humor con tu muy particular forma de ver las cosas. Formaste una hermosa familia con respeto y dedicación. Vi en ti y en Ale como pareja, una hermosa relación basada en el respeto, la tolerancia, el amor, la reciprocidad y el trabajo en equipo, que considero una gran enseñanza y ejemplo.
    Lamentablemente, te nos fuiste de este plano terrenal, pero vivirás por siempre en nuestros corazones y en nuestros pensamientos. Quiero pensar que algún día nos reuniremos de nuevo, como antaño y disfrutar de momentos tan maravillosos como los que compartimos. Espero que cuando eso pase, tu cocines, si quieres, yo llevo el vino o las chelas. Descansa en paz querido Tomás.

  24. candleI greeted Tom early last week and we had a nice chat. I was so shocked when Joe informed us that Tom had suddenly passed away. He was a good friend and colleague whom I have vivid memory. He always smiled. He was caring, eager to lend help, and academically he was a great achiever. I will miss him.

  25. candleWhat a great colleague you were, Tom! Always refreshing, creating a youthful atmosphere. There was a noticeable part of your personality that stayed forever young. Your dedication, curiosity and care for others will be missed very much by everyone who knew you.

  26. candleThomas was such a kind person and sweet colleague. I was shocked and saddened for his passing and may he rest in peace!

  27. candleThomas was always a kind and considerate person, and would always warm the heart. He was also an incredibly intelligent man, conversations with him were always funny and super interesting. I’ll miss him. Fuerte abrazo a todos.

  28. candleTom was a very helpful, kind and humble colleague. I was deeply shocked and saddened by the news of his sudden passing. I will miss him. May he rest in peace.

  29. candleI light this candle in profound sadness for the loss of Tom, a dear friend and research collaborator since we first met at Albert Einstein College of Medicine in 2006. Tom’s passion, intellect, and closeness support enriched our shared journey. Grateful for the memories and the knowledge we forged together. Rest in peace, Tom.

  30. candleMi querida amiga de la vida. Siento profundamente por el dolor que están pasando. Te abrazo muy fuerte y te mando millones de bendiciones.

  31. No tuve el gusto de conocer a Tomás en persona, solamente a través de lo que Ale nos contaba. Tengo el gusto y privilegio de conocer a Ale desde que teníamos 13 años y se perfecto la gran mujer que es. Se también que ella solo eligiría como compañero de vida y padre de sus hijos a un ser increíble como lo fue Tomás. Lamentó su pérdida amiga y los acompaño a la distancia.

  32. candleAle, mi adorada prima, están en mis oraciones, los quiero mucho :Lucia, Gabriel y tú Ale, están en nuestros corazones , estamos con Ustedes

  33. Queridos Ale y Thomas, ser testigo de su enamoramiento, amor, creación de una increíble familia ha sido maravilloso! Esa huella queda en mi corazón… Thomas, sigue tu camino, ve en paz, no serás olvidado, eres muy querido… en mi mente te quedas bailando en una discoteca y riéndote a carcajadas hasta cerrar los ojitos echando la cabeza para atrás y también mirando interesadamente a Ale contar una introspección, aquí te la cuidamos y abraza de mi parte a Mr MacCarthy… love you

  34. candleAs a collaborator of Tom since our time together at the Einstein College of Medicine, his passing leaves a profound loss in both the scientific community and me personally. Working alongside Tom was not just a professional journey; it was an enriching experience marked by his intellect, integrity, and compassion. Our weekly discussions, brimming with ideas and insights, will be dearly missed. His passing is not just the loss of a brilliant mind, but also of an ever blossoming friendship and collaboration. Tom’s legacy will live on in the many lives he touched, in the scientific community that he so passionately nurtured, and the many unique scientific discoveries he made. Sincerest condolences to his immediate family, his loved ones, and the scientific community at large….

  35. Querido Thomas, te vamos a extrañar mucho, dejas un vacío muy grande, fuiste un gran amigo, nos reencontramos donde no hay dolor, al final del infinito, entre los Rios de color púrpura.

  36. Querido Thomas, te vamos a extrañar mucho, dejas un vacío muy grande, fuiste un gran esposo, padre hermano y amigo, nos reencontramos donde no hay dolor, al final del infinito, entre los Rios de color púrpura.

  37. Tom and I were office neighbor since he joined our department. Both of us came to office almost everyday and saw each other everyday. When we got tired from working, we came to the hallway and had a chat to relax. Tom was always smiling and gave interesting comment on lots of things. I will miss him deeply.

  38. candleI still haven’t recovered from the state of disbelief. When I first saw the news, I had to recheck the name several times to make sure I didn’t read it wrong. I kept thinking that this shouldn’t happen to a young and healthy person. Only on the Monday of that week I sent Tom a message agreeing his suggested schedule to resume our meetings after Nov 5. Although I have known Tom for only one year, we had a fruitful collaboration with regular discussions in his office and close to 100 email exchanges. We had common research interests, complementary experiences, and perhaps similar temperament. His passing is a huge loss to us. My sincere condolence to Tom’s family and may him rest in peace.

  39. candleIn loving memory of our dear friend Tomás, a man of consequence, a force and multiplier of good, who left the world better than he found it and that’s really all what each of us aspires to be. A man as dedicated to science as to his family. With sharp wit and a fantastic sense of humor. Renaissance man. Lover of all knowledge. A voracious consumer of books with an insatiable curiosity, who never stopped learning, growing, and sharing his wisdom with all of us. Chef extraordinaire of dishes from the best tzatziki you ever had to epic camarones a la talla. Always quick with a cool Pimm’s on long summer day by the pool. A man of complexity, with multitudes within. At once solitary, other times the most gracious and gregarious of hosts. As comfortable in a dimly lit pub under a grey sky in London as he was at a midnight taqueria stand in Mexico City. May your discoveries continue to inspire and enrich the lives of all who encounter them. May your humor and your unwavering love for your family be warmly remembered always.

  40. I was shocked and deeply saddened to hear of Tom’s tragic and unexpected passing. When I first arrived at Stony Brook as an assistant professor in the CS department, he immediately connected with me, welcomed me, and helped to make me feel comfortable in my new academic home. It was always a pleasure talking science with Tom, and learning from him. Even after I moved to another university, I would run into Tom at the Cold Spring Harbor meetings, and was happy to have a chance to catch up with him. He was always so kind and generous, and set an example of not just how to be an excellent scientist, but a great person and a true family man. You’re sorely missed and well-remembered, Tom. May his memory be a blessing.

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