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Genetics Care Team

Our geneticists and genetic counselors at Stanford Children's Health are committed to providing excellent patient care through comprehensive diagnostic evaluation, clinical management, and genetic counseling. We are dedicated to furthering genetic research to improve patient care and therapeutic options. Genetic conditions can impact different aspects of health and present with a variety of symptoms.

Jonathan Bernstein, MD, PhD

Jonathan Bernstein, MD, PhD, is the Chief of Genetics at Stanford Children’s Health. He is board certified in Genetics, Genomics, and Pediatrics.

Areas of expertise: Genetics, Differences of Sexual Development (DSD) and Sex Chromosomal Aneuploidies, Cleft and Craniofacial

David Stevenson, MD

David Stevenson, MD, is board certified in Clinical Genetics and Pediatrics.

Areas of expertise: Genetics, Bone Health, Prader-Willi Syndrome, Vascular Anomalies

Gregory Enns, MD

Gregory Enns, MD, is the Director of the Biochemical Genetics Program at Stanford Children’s Health. He is board certified in Clinical Biochemical Genetics, Clinical Genetics and Genomics.

Areas of expertise: Genetics, Neurometabolic, Neurogenomics

Natalia Gomez-Ospina, MD, PhD

Natalia Gomez-Ospina, MD, PhD, is board certified in Clinical Genetics.

Areas of expertise: Genetics, Neurometabolic, Neurogenomics

Louanne Hudgins, MD

Louanne Hudgins, MD, is board certified in Clinical Genetics and Genomics.

Areas of expertise: Genetics, Clinical Genomics, Genetic Skin Diseases, Perinatal Diagnostics, Fetal and Pregnancy Health

Chung Lee, MD

Chung Lee, MD, is board certified in Clinical Biochemical Genetics, Clinical Genetics, and Pediatrics.

Areas of expertise: Genetics, Neurometabolic, Neurogenomics

Melanie Manning, MD

Melanie Manning, MD, is board certified in Clinical Cytogenetics, Clinical Genetics, and Pediatrics.

Areas of expertise: Genetics, Down Syndrome

Dena Matalon, MD

Dena Matalon, MD, is board certified in Clinical Genetics and Pediatrics.

Areas of expertise: Genetics, Neurometabolic, Neurogenomics, Alagille Syndrome

Eric Muller II, MD, PhD

Eric Muller II, MD, PhD, is board certified in Clinical Genetics and Pediatrics.

Areas of expertise: Genetics

    Genetic Counselors

    Karli Blocker, MS, LCGC

    Karli Blocker, MS, LCGC, is a genetic counselor in Stanford Children’s Health Specialty Services - San Francisco Specialty Services. She received her undergraduate degree from the University of California, Davis, in 2014 and her master’s degree in genetic counseling from University of Arkansas for Medical Sciences, Little Rock, in 2018. She joined Lucile Packard Children’s Hospital Stanford in 2018.

    Devon Bonner, MS, LCGC

    Devon Bonner, MS, LCGC, is a genetic counselor in Medical Genetics and the Stanford University Center for Undiagnosed Diseases. She received her undergraduate degree from University of South Florida in 2011 and her master’s degree in genetic counseling from the Johns Hopkins University/National Human Genome Research Institute in 2017. She joined the Stanford University Center for Undiagnosed Diseases, clinical site of the Undiagnosed Disease Network, in 2017 and joined Medical Genetics in 2018.

    Maia Borensztein, MS

    Maia Borensztein, MS, LCGC, is a genetic counselor in Medical Genetics. She received her undergraduate degree from the University of Massachusetts Amherst in 2016 and her master’s degree in genetic counseling from Stanford University in 2020. Her graduate research was on the critical components of informed consent for genetic testing. She joined Lucile Packard Children’s Hospital Stanford in July 2020 and participates in the Medical Genetics clinic and coordinates the Down Syndrome Clinic.

    Alleigh Boyd, MS, LCGC

    Alleigh Boyd, MS, LCGC, is a genetic counselor in the Stanford Medicine Fertility and Reproductive Health Services Clinic. She received her undergraduate degree from the University of California, Santa Barbara, in 2010 and her master’s degree in genetic counseling from the University of Oklahoma Health Sciences Center in 2015. She joined Lucile Packard Children’s Hospital Stanford in 2015 to become the first genetic counselor in the Fertility and Reproductive Health Services clinic. She works with patients who utilize pre-conception carrier screening and preimplantation genetic testing.

    Stephanie Burke, MS, LCGC, is a genetic counselor in Perinatal Genetics. She received her undergraduate degree from the University of California in 1993 and her master’s degree in genetic counseling from University of Colorado Health Sciences Center in 2005. She previously worked at Integrated Genetics as a prenatal genetic counselor. She joined Lucile Packard Children’s Hospital Stanford in 2019 and sees patients in the Perinatal Diagnostic Center in Fremont.

    Laurel Calderwood, MS, LCGC

    Laurel Calderwood, MS, LCGC, is a genetic counselor in Medical Genetics and clinical assistant professor, Department of Pediatrics. She received her undergraduate degree from Rochester Institute of Technology in 2009 and her master’s degree in genetic counseling from Boston University in 2012. She started her career at Boston Children’s Hospital. She joined Lucile Packard Children’s Hospital Stanford in 2016 and focuses her clinical work primarily in the Metabolic and Neurometabolic clinics.

    Kelly Chen, MS, LCGC

    Kelly Chen, MS, LCGC, is a genetic counselor and manager for Lucile Packard Children’s Hospital Stanford. She received her undergraduate degree from the University of California, Berkeley, in 1990 and her master’s degree in genetic counseling from the University of California, Irvine, in 1995. She first joined Packard Children’s Hospital in 1996 and enjoyed a long career as a pediatric and prenatal genetic counselor. She spent the last five years in industry and rejoined the hospital in 2020.

    Jane Chinn, MS, LCGC

    Jane Chinn, MS, LCGC, is a genetic counselor in Perinatal Genetics and clinical instructor, Department of Pediatrics. She received her undergraduate degree from the University of California, Los Angeles, in 2004 and her master’s degree in genetic counseling from the University of California, Irvine in 2008. She previously worked at Integrated Genetics as a genetic counselor at multiple perinatal offices in the San Francisco Bay Area. She joined Lucile Packard Children’s Hospital Stanford in 2013 and enjoys being involved in the clinical supervision of genetic counseling students.

    Kyla Dunn, MS, LCGC

    Kyla Dunn, MS, LCGC, is a genetic counselor at the Stanford University Center for Inherited Cardiovascular Disease (Pediatric Cardiology) specializing in hereditary cardiomyopathies and arrhythmia syndromes. She received her undergraduate degree from Yale College in 1993 and her master’s degree in genetic counseling from Stanford University in 2011. She joined the Betty Irene Moore Children’s Heart Center in 2012 as its first genetic counselor. She has experience with postmortem genetic testing following the sudden cardiac death of a young person.

    Natalie Dykzeul, MS, LCGC

    Natalie Dykzeul, MS, LCGC, is a genetic counselor in Medical Genetics. She received her undergraduate degree from California State University Stanislaus in 2016 and her master’s degree in genetic counseling from Virginia Commonwealth University in 2018. She was a trainee in the Virginia Leadership Education in Neurodevelopmental Disabilities (Va-LEND) program while in graduate school. She joined Lucile Packard Children’s Hospital Stanford in 2018 and is currently working in both the Medical Genetics and the Biochemical Genetics clinics. She is also the dedicated genetic counselor in the multidisciplinary Cleft & Craniofacial and Craniosynostosis clinics.

    Ellyn Farrelly, MS, MA, LCGC

    Ellyn Farrelly, MS, MA, LCGC, is the genetic counselor supervisor in Medical Genetics and a clinical assistant professor, Department of Pediatrics. She received her undergraduate degree from California State University, Sacramento in 1995 and her master’s degree in genetic counseling from Stanford University in 2010. She also has a master’s degree in Divinity and Ethics from University of Chicago. Before returning to Lucile Packard Children’s Hospital Stanford in 2015, Ellyn worked at Santa Clara Valley Medical Center providing genetics care across the life span, including prenatal, pediatric, and adult genetics. She has been the genetic counseling supervisor in Medical Genetics since 2018. She helps coordinate the RASopathy/Neurofibromatosis clinic in Medical Genetics.

    Kristi Guinon, MS, LCGC

    Kristi Guinon, MS, LCGC, is a genetic counselor in Perinatal Genetics. She received her undergraduate degree from University of the Pacific, Stockton, in 1985 and her master’s degree in genetic counseling from the University of California, Berkeley, in 1990. She previously worked at the UCSF Prenatal Diagnostic Center as a prenatal genetic counselor. She joined Lucile Packard Children’s Hospital Stanford in 1992 and sees patients at the Perinatal Diagnostic Center Sequoia site.

    Andrea Hanson-Kahn, MS, LCGC

    Andrea Hanson-Kahn, MS, LCGC, is a genetic counselor in Medical Genetics. She received her undergraduate degree from the University of California, Berkeley, in 1996 and her master’s degree in genetic counseling from the University of California, Irvine. She has been at Stanford since 2000 and has worked in the Medical Genetics, Genetic/Dermatology, Craniofacial Anomalies, and outreach clinics. She has been the associate director of the MS in Human Genetics and Genetic Counseling training program at Stanford since 2009.

    Whitney Heinrichs, MS, LCGC

    Whitney Heinrichs, MS, LCGC, is a genetic counselor in Perinatal Genetics. She received her undergraduate degree from the University of California, Los Angeles, in 2002 and her master’s degree in genetic counseling from the University of Colorado Health Sciences Center in 2005. Whitney first joined the hospital as a summer volunteer, an administrative assistant, a genetic counseling intern, and as a genetic counselor in 2005. She has been the primary genetic counselor at the Santa Cruz satellite clinic since 2006.

    Meg Homeyer, MS, LCGC

    Meg Homeyer, MS, LCGC, is a genetic counseling supervisor and patient care coordinator in the Fetal and Pregnancy Health Program in Perinatal Genetics. She received her undergraduate degree from Stanford University in 1989 and her master’s degree in genetic counseling from the University of California, Berkeley, in 1999. Homeyer joined Lucile Packard Children’s Hospital Stanford in 1999 as a Perinatal genetic counselor. In 2009, she became the patient care coordinator for the center for the Fetal and Pregnancy Health Program.

    Hannah Ison, MS, LCGC

    Hannah Ison, MS, LCGC, is a cardiovascular genetic counselor who specializes in congenital heart defects and familial hypercholesterolemia. She received her undergraduate degree from the University of California, Santa Cruz, in 2014 and her master’s degree in genetic counseling from Indiana University in 2018. She joined the Stanford Center for Inherited Cardiovascular Disease in 2018 and works as both an adult and pediatric genetic counselor.

    Jenny Kim, MS

    Jenny Kim, MS, LCGC, is a genetic counselor in Medical Genetics. She received her undergraduate degree from Cornell University in 2017 and her master’s degree in genetic counseling from Northwestern University in 2020. She joined Lucile Packard Children’s Hospital Stanford in 2020 and works in both the Medical Genetics and Biochemical Genetics clinics as the prenatal liaison.

    Rachel Mangels, PhD, MS, LCGC

    Rachel Mangels, PhD, MS, LCGC, is a genetic counselor in Perinatal Genetics. She received her undergraduate degree from Washington University in St. Louis in 2009 and her master’s degree in genetic counseling from Stanford University in 2019. Before earning her master’s, She completed a PhD in molecular biology from the University of Southern California. She joined the Stanford University Perinatal genetic counseling team in 2019 and sees patients primarily at Lucile Packard Children’s Hospital Stanford.

    Molly McGuinness, MS, LCGC

    Molly McGuinness, MS, LCGC, is a genetic counselor at the Bass Center for Childhood Cancer and Blood Diseases. She received her undergraduate degree from Villanova University in 2016 and her master’s degree in genetic counseling from Boston University School of Medicine in 2020. After graduation, She spent two years working in cancer clinical research at Columbia University Medical Center. In 2020, she joined Lucile Packard Children’s Hospital Stanford, where she sees pediatric oncology patients and their families.

    Aiste Narkeviciute, MS, LCGC

    Aiste Narkeviciute, MS, LCGC, is a genetic counselor in the Cardiovascular Connective Tissue Disorders Clinic. She received her undergraduate degree from Boston College in 2007 and her master’s degree in genetic counseling from Stanford University. She joined Lucile Packard Children’s Hospital Stanford in 2018 and works with individuals with aortopathies, as well as individuals with Williams syndrome. Her previous positions include work in health care consulting as well as biotechnology.

    Brooke Nightingale, MS, LCGC

    Brooke Nightingale, MS, LCGC, is a genetic counselor in Medical Genetics. She received her undergraduate degree from California Polytechnic State University in 2015 and her master’s degree in genetic counseling from Ohio State University in 2018. She was a LEND fellow at the Ohio State University, where she completed coursework and research in neurodevelopmental disabilities. She joined Lucile Packard Children’s Hospital Stanford in June 2018 and participates in the Medical Genetics clinic as well as the Osteogenesis Imperfecta (OI) multidisciplinary clinic. She serves as the clinic coordinator for the Differences of Sexual Development (DSD) multidisciplinary clinic.

    Sunny Norton, MS, LCGC

    Sunny Norton, MS, LCGC, is a genetic counselor in Perinatal Genetics and clinical instructor, Department of Pediatrics. She received her undergraduate degree from California Polytechnic State University in 2007 and her master’s degree in genetic counseling from the University of Colorado Denver in 2010. Before joining the Perinatal Genetics group, she was a laboratory genetic counselor at Diagnostic Cytogenetics, Inc., in Seattle, where she served as a client liaison, providing information and resources to medical providers for prenatal, pediatric, and hematologic cases. She sees patients in the Perinatal Diagnostic Center, Salinas.

    Susan Schelley, MPH, LCGC

    Susan Schelley, MPH, LCGC, is a genetic counselor in Medical Genetics and clinical assistant professor, Department of Pediatrics. She received her undergraduate degree from Stanford University in 1979 and her master’s degree in genetic counseling from the University of California, Los Angeles, in 1983. Over her 30 years at Stanford University, she has been very involved in teaching genetics, including lecturing for various medical student courses and supervising genetics residents, postdocs, and genetic counseling students.

    Lauren Schenck, MS, LCGC, is a genetic counselor in the Pediatric Neurogenomics Program. She received her undergraduate degree from the University of California, San Diego, in 2012 and her master’s degree in genetic counseling from the Icahn School of Medicine at Mount Sinai in 2014. She began her career at the Mills Peninsula Dorothy Schneider Cancer Center in San Mateo, providing cancer genetic counseling. She then practiced at Kaiser Permanente in Oakland and joined Lucile Packard Children’s Hospital Stanford in 2020.

    Jenice Sican, MS, LCGC, is a genetic counselor in Perinatal Genetics. She received her undergraduate degree from California State University Stanislaus in 2009 and her master’s degree in genetic counseling from the University of California, Irvine, in 2011. She previously worked at Integrated Genetics before joining Lucile Packard Children’s Hospital Stanford in 2017. She sees patients in the Perinatal Diagnostic Center, Modesto.

    Carly Siskind, MS, LCGC

    Carly Siskind, MS, LCGC, is a genetic counselor in Neurology and clinical associate professor of neurology (affiliated) who specializes in neuromuscular genetics and Charcot-Marie-Tooth disease. She received her undergraduate degree from the University of Michigan in 2004 and her master’s degree in genetic counseling from Northwestern University in 2007. Before joining the neuromuscular team in 2011, she worked in neurogenetics at Wayne State University in Detroit. She sees patients both at Stanford Hospital and Lucile Packard Children’s Hospital Stanford.

    Emma Smith, MS, LCGC

    Emma Smith, MS, LCGC, is a genetic counselor in Medical Genetics. She received her undergraduate degree from the University of Iowa in 2015 and her master’s degree in genetic counseling from the University of British Columbia in 2017. She joined Lucile Packard Children’s Hospital Stanford in 2017 and provides genetic counseling in the Medical Genetics clinic, including serving patients in the general genetics clinic as well as subspecialty clinics, such as the RASopathies and vascular anomalies clinics.

    Jenna Stoltzfus, MS, LCGC

    Jenna Stoltzfus, MS, LCGC, is a genetic counselor in Perinatal Genetics. She received her undergraduate degree from Boston University in 2013 and her master’s degree in genetic counseling from Stanford University in 2020. She joined Lucile Packard Children’s Hospital Stanford in 2020 and sees patients in the Perinatal Diagnostic Centers at El Camino and Stanford.

    Karina Talreja, MS, LCGC

    Karina Talreja, MS, LCGC, is a genetic counselor in Perinatal Genetics. She received her undergraduate degree from Stanford University in 2015 and her master’s degree in genetic counseling from Stanford University in 2017. After graduation, she worked as a prenatal genetic counselor with Integrated Genetics in San Jose before joining the Lucile Packard Children’s Hospital Stanford perinatal genetic counseling team in 2019. She sees patients in the Perinatal Diagnostic Center and through the Fetal and Pregnancy Health Program.

    Marian Tsang, MS, LCGC

    Marian Tsang, MS, LCGC, is a genetic counselor in Perinatal Genetics. She received her undergraduate degree from University of California, Riverside in 2017 and her master’s degree in genetic counseling from the University of California, Irvine in 2020. She joined the Stanford Children’s perinatal genetic counseling team in 2020 and sees patients primarily at Lucile Packard Children’s Hospital Stanford.

    Rachel Zimmer, MS, LCGC

    Rachel Zimmer, MS, LCGC, is a genetic counselor in Perinatal Genetics. She received her undergraduate degree from SUNY Binghamton in 2000 and her master’s degree in genetic counseling from Sarah Lawrence College in 2003. She worked for 11 years as a prenatal genetic counselor for Genzyme Genetics and Integrated Genetics seeing patients at various clinics in the Central Valley and Bay Area. She joined Lucile Packard Children’s Hospital Stanford in 2014 and sees patients in the Perinatal Diagnostic Center Salinas.

      Nurse Practitioner

      Holly Bernal, RN, MSN, FNPc

      Holly Bernal, RN, MSN, FNPc, is the nurse practitioner in Biochemical Genetics. She received her undergraduate degree from San Francisco State University in 1991 and her master’s degree from University of California, San Francisco in 1999. She received her Certification as a Family Nurse Practitioner from San Francisco State in 2015, prior to joining Stanford Genetics. In her current role she is a provider in Metabolic Clinic and the Enzyme Replacement Therapy program, coordinates the Newborn Screening Program, participates in didactics for the Medical Genetics Residents, and supervises APP students.

        Social Worker

        Robin Newman, MSW, is a Social Worker.

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