Senior Staff

Dr. James Weber, Ph.D.
Founder and President

Dr. James Weber, Ph.D

Dr. James Weber founded PreventionGenetics in 2004 with a vision of "disease prevention through genetic testing." That vision has helped build a rapidly expanding company that provides comprehensive low cost, high quality clinical DNA testing.

An internationally acclaimed research scientist, Dr. Weber was a major contributor to The Human Genome Project. His discovery of Short Tandem Repeat Polymorphisms (microsatellites) and creation of the Marshfield Maps of the human genome was a significant advance in human genetics. He has authored or co-authored more than 200 peer-reviewed scientific publications (Click here for CV link).

Dr. Weber received a B.S. degree in chemistry from the University of Wisconsin-Madison, and a Ph.D. in biochemistry from the University of California-Berkeley. From 1982-1986, he served in the United States Army working on malaria vaccines at the Walter Reed Army Institute of Research in Washington. In 1986, Dr. Weber joined Marshfield Clinic Research Foundation where he was senior research scientist, director of the Center for Medical Genetics and director of the National Institutes of Health-funded Mammalian Genotyping Service.

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Amy Nystrom
Chief Business Officer (CBO)

Amy Nystrom, CBO

Amy Nystrom joined PreventionGenetics in January 2013. As the Chief Business Officer (CBO), she is the President's chief advisor for oversight and administration of all business aspects of the company. She assists the president with creating, communicating, executing, and sustaining strategic business initiatives ensuring that the Company's business operations are efficient and effective and the company maintains financial stability. As CBO she serves as secretary to the corporate board of directors and is the director of accounting and business development. Nystrom is a graduate of Central Michigan University, holding a bachelor's degree in accounting and finance. She earned a master's degree in business administration from Lakeland College in Sheboygan, Wisconsin

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Dr. Tony Krentz, Ph.D
Chief Operating Officer (COO)

Dr. Tony Krentz, Ph.D

Dr. Krentz specializes in Ciliopathies

Tony Krentz joined PreventionGenetics in 2011 as a Human Molecular Geneticist. Tony has played a key role in developing and validating NextGen Sequencing tests at PreventionGenetics. During his tenure he has been the director of R&D, NextGen Sequencing, and Specimen Processing departments. As COO he works with the President to develop strategic plans, set priorities, and allocate resources to achieve company goals. Tony Krentz received his PhD in Molecular, Cellular, Developmental Biology and Genetics from the University of Minnesota.

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Dr. Jerry Machado, Ph.D
Chief Operating Officer (COO)

Dr. Jerry Machado, Ph.D

Dr. Machado specializes in Hereditary Cancer Syndromes

Jerry Machado is an ABMGG and CCMG-certified Lab Director in molecular genetics, and Chief Operating Officer at PreventionGenetics. He received his BSc and MSc in Molecular Biology and Genetics from York University in Toronto, Canada. Jerry then received his PhD in Cancer Genetics at the University of Toronto. He then went on to complete a 2-year clinical molecular genetics fellowship at the Hospital for Sick Children in Toronto. Jerry joined PreventionGenetics in 2012 and is a specialist in the genetic causes of inherited cancer syndromes, and leads the effort of whole exome sequencing. In addition, he is responsible for operations, strategic decisions, and policies of the company.

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Dr. Angela Gruber, Ph.D

Dr. Angela Gruber, Ph.D

Dr. Gruber specializes in Muscle Disorders

Angela Gruber, Ph.D., joined PreventionGenetics in June 2014 as a Human Molecular Geneticist. Her portfolio includes neuromuscular disorders such as myopathies, muscular dystrophies, and neuropathies such as Charcot-Marie- Tooth Disease. She is the current director of the Specimen Processing Department at PreventionGenetics. Dr. Gruber earned her PhD in Biochemistry from the University of Wisconsin.

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Dr. Ben Dorshorst, Ph.D

Dr. Ben Dorshorst, Ph.D

Dr. Dorshorst specializes in Hearing Disorders

Ben Dorshorst, Ph.D., joined PreventionGenetics in January 2016 as a Human Molecular Geneticist. His portfolio focuses on Hearing Loss and Deafness. Dr. Dorshorst received a Ph.D. in functional genomics from North Carolina State University. He completed his undergraduate work at the University of Wisconsin. Prior to coming to PreventionGenetics, Dr. Dorshorst was an Assistant Professor of Genetics at Virginia Tech.

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Dr. Diane Allingham-Hawkins, Ph.D, FCCMG, FACMG

Dr. Diane Allingham-Hawkins, Ph.D

Dr. Allingham-Hawkins specializes in Cytogenetics and Hereditary Cancer Syndromes

Dr. Diane Allingham-Hawkins is a Laboratory Director at PreventionGenetics, LLC, in Marshfield, WI. She is dual-certified in molecular genetics and cytogenetics by the Canadian College of Medical Geneticists (CCMG). Dr. Allingham-Hawkins earned her BSc in Honors Genetics from the University of Western Ontario in 1987 and her PhD from McMaster University in 1993. She completed her post-doctoral fellowship in Molecular Genetics at the Hospital for Sick Children in Toronto, Canada in 1995. Prior to joining PreventionGenetics, Dr. Allingham-Hawkins was a private genetics laboratory consultant from 2015 to 2016 and Senior Director of Genetic Test Evaluation and Technical Editing at Hayes, Inc. from 2008 to 2015.

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Dr. Fang Xu, Ph.D, FACMG

Dr. Fang Xu, Ph.D, FACMG

Dr. Xu specializes in Infertility and Sex Development

Fang Xu, Ph.D., FACMG joined PreventionGenetics in January 2016 as an Associate Laboratory Director. She is an ABMG-certified clinical cytogeneticist. Her portfolio focuses on reproductive disorders and infertility. Dr. Xu received her Ph.D. in Genetics from Nanjing University in China. She completed the ABMG fellowship in Clinical Cytogenetics at Yale University, Department of Genetics.

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Dr. Guoli Sun, M.D., Ph.D, FACMG

Dr. Guoli Sun, Ph.D

Dr. Sun specializes in Cardiovascular Disorders

Guoli Sun, M.D., Ph.D., FACMG, joined PreventionGenetics in 2014 as an ABMG certified Clinical Molecular Geneticist. His portfolio includes Cardiovascular and Metabolic disorders. He is also the director of the research and development department at PreventionGenetics. Dr. Sun received his medical degree from Peking University Health Science Center and his Ph.D. in molecular genetics and microbiology from Rutgers University. After completing his doctoral degree, Dr. Sun completed a fellowship in Clinical Molecular Genetics at University of Washington Medical Genetics Program.

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Dr. Jiabin Zhang, Ph.D

Dr. Jiabin Zhang

Dr. Zhang specializes in Pharmacogenetics, Spastic Paraplegia

Jiabin Zhang, Ph.D., joined PreventionGenetics in December 2015 as a Human Molecular Geneticist. His portfolio includes pharmacogenomics and neuromuscular disorders such as hereditary spastic parapleiga (HSP) and distal hereditary motor neuropathy (dHMN). Dr. Zhang received his Ph.D. in Neuroscience from the University of Wisconsin-Madison. Prior to coming to PreventionGenetics, he was a Research Fellow at the Mayo Clinic.

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Dr. Juan Dong, MD, Ph.D, FACMG

Dr. Juan Dong, Ph.D, FACMG

Dr. Dong specializes in Skeletal, Skin, Dental Disorders

Juan Dong, MD, Ph.D., FACMG, joined PreventionGenetics in March 2012 and currently serves as a laboratory director. She is an ABMGG-certified clinical Molecular Geneticist. Her portfolio at PreventionGenetics focuses on skeletal, skin and dental genetic disorders. She received her medical and master's degrees from Harbin Medical University in China and her Ph.D. degree from the Heidelberg University in Germany. She completed the American Board of Medical Genetics training in clinical molecular genetics at the University of Alabama in Birmingham.

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Dr. Khemissa Bejaoui, Ph.D

Dr. Khemissa Bejaoui, Ph.D

Dr. Bejaoui specializes in Developmental Disorders and ALS

Khemissa Bejaoui, Ph.D., is a clinical Molecular Geneticist at PreventionGenetics. Her portfolio of tests focuses on neurologic disorders. She received her Ph.D. at the University of Paris XI in France. Prior to joining PreventionGenetics, she worked as an independent investigator at the Marshfield Clinic Research Foundation. She also spent several years in the Day Neuromuscular Laboratory of Massachusetts General Hospital and Harvard Medical School. Dr. Bejaoui helped identify the genes involved in in several neuromuscular diseases, including Amyotrophic Lateral Sclerosis (ALS), Limb-Girdle Muscular Dystrophy and a Hereditary Sensory Neuropathy.

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Dr. Kym Bliven, Ph.D

Dr. Kym Bliven, Ph.D

Dr. Bliven specializes in Mitochondrial Disorders

Kym Bliven, Ph.D., joined PreventionGenetics in August 2015 as a Human Molecular Geneticist. Her portfolio focuses on mitochondrial disorders. Dr. Bliven received her Ph.D. from the Uniformed Services University of the Health Sciences.

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Dr. Li Fan, MD, Ph.D, FCCMG, FACMG

Dr. Li Fan, MD, Ph.D, FCCMG, FACMG

Dr. Fan specializes in Epilepsy, Intellectual Disorders

Li Fan, MD, PhD, M.Phil. FCCMG, FACMG, joined PreventionGenetics in July 2015 as an Associate Laboratory Director. Her primary area of expertise is clinical molecular genetics in neuroscience. Dr. Fan's portfolio at PreventionGenetics includes tests for Epilepsy and Intellectual Disability. Dr. Fan received her medical degree from Zhejiang Medical University and her Ph.D. in biochemistry from The University of Queensland in Australia. She has been working in a Clinical Molecular Diagnostic setting for over 15 years, previously at the University of Montreal.

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Dr. Luke Drury, Ph.D

Dr. Luke Drury, Ph.D

Dr. Drury specializes in Blood Disorders

Luke Drury, Ph.D., joined PreventionGenetics in September 2013 as a Human Molecular Geneticist. His portfolio focuses on blood disorders including anemias, autoinflammatory disorders and hemostatsis. He is also the director of the Sanger sequencing laboratory. Dr. Drury received his Ph.D. in microbiology and molecular genetics from the Medical College of Wisconsin. Prior to coming to PreventionGenetics, he was a postdoctoral research scholar at the University of Iowa.

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Dr. Madhulatha Pantrangi, Ph.D

Dr. Madhulatha Pantrangi, Ph.D

Dr. Pantrangi specializes in Vision Disorders

Madhulatha Pantrangi, Ph.D., joined PreventionGenetics in January 2013 as a Human Molecular Geneticist. Her portfolio focuses on eye disorders. While at PreventionGenetics, she has also served as DNA Banking Advisor. Dr. Pantrangi received her Ph.D. in genetics from the University of Delhi and her master's in biotechnology from Pondicherry University, both in India. She completed a postdoctoral fellowship at the Marshfield Clinic Research Foundation.

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Dr. McKenna Kyriss, Ph.D

Dr. McKenna Kyriss, Ph.D

Dr. Kyriss specializes in Metabolic Disorders, Huntington Disease

McKenna Kyriss, Ph.D., joined PreventionGenetics in November 2014 as a Human Molecular Geneticist. Her portfolio includes metabolic disorders and Huntington Disease. Dr. Kyriss received her B.S. in biology from Pacific Lutheran University in Tacoma, WA and her Ph.D. in Molecular Biosciences from the Washington State University.

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Dr. Mike Chicka, Ph.D

Dr. Mike Chicka, Ph.D

Dr. Chicka specializes in Blood Disorders

Michael Chicka, Ph.D., joined PreventionGenetics in August 2010 as a Molecular Geneticist. His portfolio of specialties focuses on blood disorders, including cytopenias, familial hemophagocytic lymphohistiocytosis (FHL), Fanconi anemia (FA) and inherited forms of leukemia. Dr. Chicka received his Ph.D. in cellular and molecular biology from the University of Wisconsin-Madison and worked in the department of biochemistry at the University of Kentucky in Lexington.

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Dr. Sri Sampath, Ph.D, FACMG

Dr. Sri Sampath, Ph.D, FACMG

Dr. Sampath specializes in Cytogenetics

Srirangan Sampath, Ph.D., joined PreventionGenetics in October 2013 as an American Board of Medical Genetics certified clinical cytogeneticist. He is the current director of the microarray laboratory at PreventionGenetics. His main area of focus is Chromosomal Microarray Analysis (CMA) testing. He completed an ABMGG fellowship in Clinical Cytogenetics at Baylor College of Medicine, Department of Molecular and Human Genetics.

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Dr. Wuyan Chen, Ph.D

Dr. Wuyan Chen, Ph.D

Dr. Chen specializes in Kidney Disorders & Diabetes

Wuyan Chen, Ph.D., joined PreventionGenetics in January 2013 as a Human Molecular Geneticist. Dr. Chen's portfolio of specialties includes kidney disorders and diabetes. He is our expert of the CYP21A2 gene testing for congenital adrenal hyperplasia (CAH). He also serves as the current director of the NextGen sequencing laboratory and is the previous director or Research and Development at PreventionGenetics. A native of Guangdong Province in southern China, Dr. Chen received his Ph.D. in biochemistry and molecular biology at Shanghai Jiao Tong University, Shanghai, China.

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Dr. Greg Fischer, Ph.D

Dr. Wuyan Chen, Ph.D

Dr. Fischer specializes in Autism Spectrum Disorders

Greg Fischer, PhD, joined PreventionGenetics in October 2016 as a Human Molecular Geneticist. His portfolio focuses on disease association testing via Human Leukocyte Antigen (HLA) typing and Autism Spectrum Disorders. Dr. Fischer earned his BSc in Biochemistry and Molecular Biology from the University of Wisconsin-Eau Claire in 2011 and his PhD in Genetics from the University of Wisconsin-Madison in 2016.

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Dr. Moumita Chaki, Ph.D

Dr. Wuyan Chen, Ph.D

Dr. Chaki specializes in Intellectual Disability

Moumita Chaki, PhD, joined PreventionGenetics in 2016 as a Human Molecular Geneticist. Her portfolio focuses on Intellectual disability. Dr. Chaki received a PhD in human molecular genetics from Indian Institute of Chemical Biology (conferred by Jadavpur University). She completed her postdoctoral fellowship in human genetics at the University of Michigan. She has more than 14 years of work experience in rare diseases including 12+ years in human genetics.

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