Dr. Garrett Smith

A little bit about myself…

My three wonderful children are now wonderful adults, so my wife Jenny and I now share all the benefits and challenges of empty-nesters. We enjoy a good bottle of wine on the deck. I have a passion for collecting guitars. And you might find me from time to time on a midnight power boat run across Lake Tahoe.

More importantly, I know that if you and I are meeting professionally, it is probably part of a journey you didn’t plan on. I am passionate about getting you through it with all the professional and personal care possible. I will see you with every visit. We will consult together and apply all the knowledge and treatments possible.

I know that looking for an oncologist is not like finding an online contractor. You have to make a connection that you can work with for the long haul. To that end, I welcome the opportunity to meet with you, and be formally introduced.

Until then, be well.

Dr. Garrett Smith

Jelena de los Reyes

Jelly is the exuberant Phlebotomist/Lab Technician at SIO. Formally known as Jelena, she loves to travel, being active and outside. Free time is spent with her friends doing all of the above.

Born in the Philippines, Jelly has been an American resident since she was 16. She currently calls Pittsburg, California her home.

Natalie Ledesma


With over 20 years of experience as a registered dietitian nutritionist, Natalie is a well-seasoned practitioner. A board-certified specialist in oncology nutrition, Natalie is the founder of Natalie Ledesma Integrative & Functional Nutrition Consulting , the clinical nutrition specialist at Smith Precision Oncology in San Francisco and the founding dietitian for the nutrition program at the University of California, San Francisco Helen Diller Family Comprehensive Cancer Center.

Natalie serves as a consultant and speaker for Digestive Care, Inc. As a member of the Lilly Lecture Bureau Faculty, Natalie regularly presents to health care practitioners on Nutritional Counseling in Oncology Care. She is a certified LEAP therapist who helps manage adverse food reactions with an emphasis on food sensitivities. Natalie provides nutrition counseling and frequently presents nationally on various cancer and integrative health focused nutrition topics. She has taught college courses and cooking classes, and has been extensively involved in community outreach involvement.