Sanjeet Singh Grewal was born on March 26, 1987, in Ludhiana, India to parents Ranjit and Parminder Grewal. He passed away unexpectedly in Puerto Rico on February 7, 2026.

At the age of 2 ½, he moved to the US, growing up in Queens, New York and then in Fort Lauderdale, Florida. He loved sailing on oil tankers and cargo ships with his dad, earning the nickname “tornado” from the other staff due to his tendencies to dart to the control room and flip every switch that he could reach. His talkative and energetic nature complimented his older brother Rocky’s calm and thoughtful demeanor.

Sunny, as he was known to his family, lived up to his nickname in his interactions with everyone. Anytime he walked into a room, he came out with a new friend. He was generous with his time, always there to grab dinner, drinks, or extended calls with friends. He had an uncanny ability to make others feel heard and understood.

Once Sanjeet was determined to do something, nothing could dissuade him off that course. He would convince his parents that he had to have a certain toy and it could just be an early birthday gift (when it was October), or this would be his Christmas present (when it was February), ensuring he received not only the sought after toy, but of course, another present when his birthday or Christmas actually arrived.

A passionate and devoted fan of his sports teams, Sanjeet loved watching Xavier Musketeers basketball, cheering them on through multiple March Madness games. Rocky’s alma mater, Miami, inspired Sanjeet’s devotion to the Miami Hurricanes — he was thrilled to watch them in the 2026 National Championship game with his brother and his dad. Once he moved to Jacksonville, he became a diehard Jaguars fan. He spent every Sunday he could at Jaguars games with his kids, teaching them to scream “Duuuuuval” as loud as they could.

From an early age, Sanjeet knew that he would follow in Rocky’s footsteps and become a surgeon. Due to his accomplishments in high school, he earned a spot in a highly competitive dual enrollment program at Xavier University and the University of Cincinnati, a combined undergraduate and medical pathway straight out of high school.

After earning his Bachelors in Biology at Xavier, he moved on to the College of Medicine at the University of Cincinnati, where he received his Doctor of Medicine and graduated Alpha Omega Alpha National Honors Society. He matched into Neurosurgery at his number one choice, Mayo Clinic in Jacksonville, Florida. He was the second ever resident in this new residency program, establishing a high standard for the residents who followed. He completed a fellowship in Surgical Epilepsy at Mayo Clinic in Rochester, Minnesota, and Stereotactic & Functional Neurosurgery at Mayo Clinic, Florida. After graduating residency in the middle of Covid, he went straight into practice as an attending at Mayo Clinic, Florida. Since he was not busy enough, in July of 2025, he started a Master’s program in Artificial Intelligence in Healthcare at the Mayo Graduate School.

Board certified in 2023, Dr. Grewal was a rising star in neurosurgery. He was the Director of Epilepsy and Movement Disorders at Mayo Clinic, Florida and the Associate Program Director of the Residency. Despite being only five years out from residency, he was on the fast track to be a full professor in 2026. He was a lead investigator in several national clinical trials for deep brain stimulation for stroke patients, stem cellular therapy to treat Parkinson’s disease, and using artificial intelligence to identify causes of seizures. He authored over 100 peer reviewed publications, 30 book chapters in neurosurgery, and directed several courses, teaching other neurosurgeons, residents and consultants alike. He was frequently invited to teach and lecture across the United States and abroad.

Teaching and mentorship mattered deeply to him, and he took pride in helping train future neurosurgeons while setting a high standard for patient care and professionalism. He truly embodied the Mayo Clinic creed: “the needs of the patient come first”.

More than any professional achievements, his greatest joy was his family. As an 18 year old at Xavier, he met and fell in love with Angela, starting a relationship that spanned almost 20 years at the time of his untimely death. Dating all throughout Xavier, plus their respective time at medical and law school, they married on March 22, 2014. They shared a love for Skyline Chili, traveling the world (and the world at Epcot), nerding out, spending time with loved ones and, of course, their children. They constantly pushed each other to be the best versions of themselves — Sanjeet shared that much of his success was possible because he was lucky: he knew Angela was his rock behind him, and supported him in giving so much of himself to other people.

Sanjeet loved being a father. His three kids, Neal (9), Aria (6), and Ryan (4) were his whole world. Every night before they went to bed, they raced to be the first to give him a hug and kiss, saying, “Good night, dada. I love you, dada.” Sanjeet shared with his children his love of the water, whether it be swimming, boating, fishing, or relaxing in the hot tub. One of his greatest accomplishments was getting his children to love good seafood almost as much as he did. Even though he was extraordinarily busy in his career, he excitedly carved out one-on-one time for dad-ventures with them each year. His favorite medical conferences were the ones that doubled as family vacations.

Following in the legacy of his father, at a recent conference, Neal ordered a round of Shirley Temples for the friends he had just made. Aria inherited Sanjeet’s adventurous spirit, eager to try new things, especially food. Ryan shares Sanjeet’s curious nature about the world and how things worked; Sanjeet dismantled many a childhood toy to understand its inner workings.

Sanjeet lived fully and loved deeply, leaving his mark in quiet acts of loyalty as much as in extraordinary accomplishments. Though his time with us was far too short, the measure of his life is not found in its length, but in its depth. In the patients he healed, the students he mentored, the friends he gathered, and the family he cherished, his legacy endures.

Sanjeet was many things to many people — a son, brother, nephew, uncle, husband, father, and friend. So many considered him their best friend, and each one was right.

A viewing was held from 6:00 p.m. to 8:00 p.m. on Friday, February 20, 2026, at Quinn-Shalz Funeral Home, 3600 3rd Street South, Jacksonville Beach, Florida 32250.

A Memorial Service honoring Sanjeet’s life will take place from 1:00 p.m. to 4:00 p.m. on Sunday, February 22, 2026, at the Hilton Jacksonville at Mayo Clinic, Conference Center, 4745 Transformation Way, Jacksonville, Florida 32224. The memorial program will begin promptly at 2:00 p.m.

In lieu of flowers, the family asks that those who wish to honor Sanjeet’s memory consider making a donation to a Memorial Fund established in his name to support Epilepsy and Neurofunctional Research at Mayo Clinic. Contributions may be made by visiting: https://give.mayoclinic.org/campaign/770327/donate. Through this fund, Sanjeet’s legacy will continue to advance research, innovation, and compassionate care for those affected by neurological conditions.