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existence genetics senior management team

Juan-Sebastian Saldivar, MD, FACMG
Laboratory Director

Dr. Saldivar is a clinical molecular geneticist with significant experience in directing molecular diagnostic laboratories. While a doctor at Harvard/Partners Center for Human Genetics and Genomics in Boston (HPCGG), Dr. Saldivar completed two fellowships: one in Medical Genetics and another in Clinical Molecular Genetics. He has published extensively in the field of molecular genetics on the association between genetic variants and disease. Dr. Saldivar also has vast experience in the area of gene sequencing, including next-gen sequencing.

Dr. Saldivar serves as a Diplomat of both the American Board of Pathology (ABP) in Molecular Genetic Pathology and the American Board of Medical Genetics (ABMG) in Clinical Molecular Genetics. He is also a Fellow of the American College of Medical Genetics (ACMG) and a Member of both the Association for Molecular Pathology (AMP) and the American Society of Human Genetics (ASHG). Dr. Saldivar received his MD from the University of Texas Southwestern Medical School.

Brandon Colby, MD | Chief Executive Officer

Brandon Colby, MD, MBA

Founder & Chief Executive Officer

Brandon Colby, MD, is a world leader in the field of predictive medicine and the author of the popular book Outsmart Your Genes, the definitive layperson’s guide to predictive medicine. In addition to being the founder and CEO of Existence Genetics, Dr. Colby also serves as the Medical Director of Existence Health, a predictive medicine private practice located in Los Angeles.

Dr. Colby has been involved in the genetics field for more than 12 years, first as a researcher and now as a practicing physician. He has conducted extensive research in the field of advanced clinical genetic analysis, inventing numerous patent-pending technologies that make comprehensive genetic screening understandable, useful, and empowering to both physician and patient. Dr. Colby is also the only practicing physician in the world to have designed a first-of-its-kind DNA Chip. This DNA Chip allows Existence Genetics not only to assess a person's risk for hundreds of diseases and traits at a single time at relatively low cost but also to concurrently provide genetically tailored preventive recommendations to protect against those diseases to which the person is found to be predisposed.

He holds a degree in Genetics from the University of Michigan Honors Program, an MD from the Mount Sinai School of Medicine, and an MBA from Stanford University's Graduate School of Business.

Dr. Colby is an Affiliate Specialist of the American College of Medical Genetics (ACMG), an Associate of the American College of Preventive Medicine (ACPM), and a member of the American Society of Human Genetics (ASHG), the American Medical Association (AMA), and the National Society of Genetic Counselors (NSGC).

Ashwin Kotwaliwale, MD, PhD, MS | Director of Bioinformatics

Ashwin Kotwaliwale, MD, PhD, MS
Director of Bioinformatics

As an expert in bioinformatics, an advanced database architect and administrator, and a medical doctor, Dr. Kotwaliwale brings an extremely diverse and unique skill-set to the information technology component of Existence Genetics. He has nearly 10 years of experience as a bioinformatics developer specializing in medical genetics and has a unique ability to conceptualize complex problems facing doctors and researchers.

Dr. Kotwaliwale successfully developed a web portal for cardiac risk assessment and is conversant with microarray construction and utilization such as for Affymetrix, Illumina, as well as open source, arrays. He has also developed a novel software program for training geneticists to identify human chromosomes and karyotype clinical cases and is a co-inventor of two patent applications useful in clinical cytogenomics. Dr. Kotwaliwale has also developed technology implementation plans for startup companies and has led a team of software developers.

He received his PhD in Bioinformatics from Cancer Research UK, his M.D. from KIMS Karad in India, and a Master’s Degree in Medical Genetics from the University of Glasgow in the United Kingdom. Dr. Kotwaliwale is a member of the International Standard Cytogenomic Array Consortium, the American Society of Human Genetics (ASHG), Bay.NET, ASP.NET aand several other software development groups.

Juan-Sebastian Saldivar, MD, FACMG | Laboratory Director

Existence Genetics’ current team of more than 30 officers, employees, consultants and independent contractors is working around the clock to revolutionize the field of predictive medicine. These dedicated professionals include a worldwide group of information technology specialists who have assisted in the development of our information technology infrastructure and a national team of genetic researchers who have ensured that we live up to our One Genome philosophy.
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