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Meet the Team

Eszter Hars, Ph.D.
Founder and CEO, Shwachman-Diamond Syndrome Alliance

Dr. Hars holds a Ph.D. in Molecular Biology from the University of Medicine and Dentistry of New Jersey, where she studied cancer and leukemia.  She has over 20 years of experience in scientific research and the biotech industry.  As VP of Regulatory Affairs at CytoVera Inc., a lab equipment developer for hematopoeitic stem cell banking, Dr. Hars was in charge of regulatory approval of medical devices by the U.S. Food and Drug Administration.  Dr. Hars has also managed business development as well as customer relationships at Quosa Inc., an information technology company, which was acquired in 2012 by Elsevier, the largest scientific publisher in the world.  Currently, Dr. Hars is President of a biotech startup that specializes in developing new tools for various new therapies, including CAR-T cell cancer therapy and beta cell replacement therapy for diabetes.


Dr. Hars has been engaged in SDS community building and volunteering wherever possible, since her daughter was diagnosed with Shwachman-Diamond Syndrome (SDS) in 2015. In 2020, Dr. Hars founded the SDS Alliance, a 501(c)(3) nonprofit organization.  Through the SDS Alliance, Dr. Hars is dedicated to accelerating the development of new therapies for SDS.

 New: Open Virtual Office Hours

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Medical and Scientific Advisory Board

Professor Alan Warren
Professor of Haematology, Cambridge University Hospitals, UK
NHS Foundation Trust

Professor Warren obtained his undergraduate degrees in Biochemistry (1983) and Medicine (1986) at the University of Glasgow. He completed his PhD in Molecular Biology in 1995 in the laboratory of Dr. Terry Rabbitts at the MRC Laboratory of Molecular Biology where he discovered that the LIM-only protein Lmo2 is required for haematopoiesis. He is currently Professor of Haematology at the University of Cambridge, UK, Clinical Lead for Bone Marrow Failure and Myelodysplastic Syndromes at Cambridge University Hospitals, and elected Fellow of the Academy of Medical Sciences in 2005.

His lab is focused on ribosome biology and the clinical impact of its defects. Ribosomes are the universally conserved macromolecular machines that decode the mRNA to make proteins. Defects in the ribosome assembly process cause the 'ribosomopathies', a fascinating new group of human developmental disorders that perturb hamatopoietic stem cell function and promote progression to bone marrow failure, myelodysplastic syndrome and  acute leukaemia. Professor Warren's lab discovered that defective assembly of ribosomes, the machines in all our cells that make protein, causes Shwachman-Diamond syndrome.

Professor Marc Raaijmakers
Professor of Hematology, Erasmus MC Cancer Institute, the Netherlands

Prof. Dr. Marc H.G.P. Raaijmakers, MD, Ph.D. is a professor of Hematology in the Department of Hematology at the Erasmus MC Cancer Institute, Rotterdam, the Netherlands. He received his MD from the University Utrecht and completed training in Internal Medicine and Hematology at the Radboud University Hospital in Nijmegen, the Netherlands.

He completed postdoctoral research at the Department of Stem Cell and Regenerative Biology at Harvard University and the Harvard Stem Cell Institute, revealing a concept of niche-induced oncogenesis in the hematopoietic system. He (co)-authored papers in leading journals including Nature, Cell, Cell Stem Cell, J. Exp. Med, Blood and Leukemia, served in the editorial boards and provided numerous invited lectures at international meetings, including the European and national societies of Hematology (U.S.A., France, Germany, Spain and Japan) as well as multiple sessions of the International Shwachman-Diamond Syndrome Congress.

He chairs the expertise center on Leukemia Predisposition Syndromes at the Erasmus MC Canncer institute and the EHA scientific working group on Rare Hematological Blood Cancers. His laboratory studies micro-environmental contributions to the pathogenesis of hematopoietic disease with an emphasis on the initiation and evolution of preleukemic disorders. He published several articles on Shwachman-Diamond Syndrome and lead the efforts for the development of several SDS research models.
His clinical focus is in bone marrow failure syndromes and acute myeloid leukemia.

Dr. Yigal Dror
Head of the Haematology & Director of the Marrow Failure and Myelodysplasia Program at Sick Children, Toronto, Canada

Dr. Yigal Dror is the Head of the Haematology Section and Director of the Marrow Failure and Myelodysplasia Program, senior scientist at the Genetics and Genome Biology Program at The Hospital for Sick Children, Toronto, and a member of the Institute of Medical Sciences at the University of Toronto. Dr. Dror graduated from the Hadassah Medical School of the Hebrew University in Jerusalem, and completed pediatric residency in Kaplan Hospital, Rehovot, Israel. He completed clinical fellowship in pediatric hematology/oncology and a post-doctoral research fellowship in the field of hematopoiesis and marrow failure syndromes/myelodysplasia at SickKids hospital, Toronto. In 2000 Dr. Dror assumed his current position as a clinician scientist at SickKids.


His main clinical interests are in the area of bone marrow failure and myelodysplastic syndrome, in particular Shwachman-Diamond Syndrome (SDS). His research focuses on characterization of stem cells and blood cells in these conditions, genetic etiologies and clinical outcome. He heads the Canadian Inherited Marrow Failure Registry. Dr. Dror’s lab focuses on various signaling pathways in SDS and other inherited bone marrow failure syndromes (IBMFs), including originating from ribosomal and telomere defects. The main SDS gene (SBDS) was identified by Dr. Johanna Rommens at SickKids, and Dr. Dror later also identified DNAJC21 as the second gene associated with SDS. His lab showed that IBMFS are associated with high risk (37%) of clones/MDS/AML in childhood, and found that SDS marrows are characterized by stromal dysfunction, increased angiogenesis and abnormal leukemia-gene expression in marrow progenitor cells.

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Dr. Johnson Liu
Hematologist at the MaineHealth Cancer Care, Maine Medical Center, Portland, ME, USA

Dr. Liu joined Maine Medical Center and MaineHealth Cancer Care in Portland in 2019, Maine, after serving as an attending physician at Monter Cancer Center, Long Island Jewish Medical Center, New York, for many years. He taught at the Zucker School of Medicine at Hofstra/Northwell, leading the hematology curriculum. He earned his MD degree from the University of Michigan Medical School and completed his residency at the Medical University of South Carolina and the National Institutes of Health. Dr. Liu was also a medical and hematology fellow and investigator at the National Institutes of Health, Bethesda, Maryland. His clinical interests include general hematology (anemia, thrombocytopenia, disorders of coagulation), bone marrow failure syndromes, myelodysplastic syndromes, acute and chronic leukemia, and multiple myeloma.


He has played an instrumental role in the 2011 International SDS Congress and publishing the consensus guidelines for the diagnosis and treatment of Shwachman-Diamond Syndrome (see here), and has been caring for multiple adult SDS patients while practicing in NY.

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Dr. Coleman Lindsley
Assistant Professor, Medicine, Harvard Medical School
and Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA

Dr. Coleman Lindsley, M.D., PhD. is a physician scientist at Dana-Farber Cancer Institute, specializing in research topics associated with MDS. His career has developed in conjunction with his interest in how disease evolves, and in turn, how new and existing therapies can interrupt the process of disease progression. The clinical research focus he has chosen in addressing problems with MDS has led to work in two important areas; examining how the fundamental properties of MDS change over time, and the features of MDS that cause resistance to therapy. Dr. Lindsley’s efforts include longitudinal studies of individual MDS patients over time to track how their disease progresses, as well as large studies aimed at identifying shared genetic characteristics that may indicate patients’ responsiveness or resistance to therapies offered.


The primary focus of the Lindsley laboratory is the biology and treatment of myeloid malignancies. We have used detailed genetic analysis of large cohorts of patients with myelodysplastic syndrome (MDS) and acute myeloid leukemia (AML) to define genetic pathways of disease ontogeny and to identify mutations that predict overall survival after chemotherapy and stem cell transplantation. We use mouse and cell line models to dissect the mechanistic basis of genetic cooperation during myeloid disease progression, with a specific focus on mutations that cause epigenetic alterations.

Dr. Kelly Walkovich
Associate Professor, Pediatric Hematology/Oncology; Executive Chair of NICER;
Director of the Immuno-Hematology Comprehensive Clinic; 
University of Michigan, C.S. Mott Children's Hospital; Ann Arbor, MI, USA

Dr. Walkovich is a pediatric hematologist-oncologist for the University of Michigan Health System. She received her medical degree from the University of Michigan and completed her residency at the Children’s Hospital of Philadelphia and a fellowship in hematology/oncology at the University of Michigan Health System. She oversees the care of multiple SDS patients in her region and ensures that they receive state-of-the-art care.

Dr. Walkowitch launched the North American Immuno-Hematology Clinical Education & Research (NICER) Consortium and is now the Executive Chair. Spanning over 12 member medical institutions, the mission of the NICER consortium is to provide a collaborative multidisciplinary environment to advance the education, clinical care, and research involving pediatric and adult patients with immuno-hematologic disorders, including bone marrow failure disorders such as Shwachman-Diamond Syndrome. Some of the goals of NICER include leveraging the pooled, diverse resources of the members to create a platform for clinical trials, basic science, and translational research with the development of a clinically annotated database, biorepository and network of member centers unified via a central IRB, and partner with academic societies, institutes and patient-centric nonprofit like the SDS Alliance with mutual objectives, to empower the educational initiatives and accelerate research discoveries in areas related to immuno-hematology.

Key Volunteers and Staff

Jacquelyn Kaufmann Poarch
Chair of the Adult SDS Patient Council - SDS Alliance

Jacquelyn Poarch is an adult with SDS, who was diagnosed by Dr Harry Schwachman in 1976. She has been active in patient advocacy for over 25 years.


Ms Poarch is a multi-subject certified teacher, who concentrates on science education, primarily secondary and tertiary school Biology, and Anatomy and Physiology, and Medical Terminology. She has had an eclectic career path, including as an opera singer in Europe, flying airplanes, and working in commercial aviation, as a social worker for the US Navy, and for the last 25 years, as a teacher.  During the Balkan War, she formed a 501c3, and went to Bosnia, and removed 98 teens, placed them with American families, and in high  schools so they could survive, and be educated. Ms Poarch has attended, and holds degrees and licenses from such diverse institutions as Universität Mozarteum, Salzburg, Austria, Manhattan School of Music (US), Columbia University (US), Stony Brook University (US), and Cambridge University (UK).


She is a licensed phlebotomist, and a HIPAA educator, and speaks twelve languages. She is the mother of a daughter with an unrelated rare disease.

In her role at the SDS Alliance, she manages the Adult SDS Patient Council, and finds, engages, and supports adult patients worldwide. We invite all adult SDS patients to participate and join the Adult SDS Patient Council.

Lisa Superina
Family and Community Engagement Ambassador - SDS Alliance

Lisa lives on Long Island, New York, with her husband and four daughters. Her two youngest daughters, Nora and Kayla, were genetically diagnosed with SDS after an extensive diagnosis journey - read their story, here. Lisa is a Special Education Teacher at Half Hollow Hills High School West in Dix Hills, New York. She has certifications from Birth-12th grade in Special Education, General Education, and English Language Arts and has a master's degree in Literacy. 


Lisa is passionate about helping the SDS community by supporting research and helping families advocate for their children. She jumped into action on the very same day her first child was diagnosed, raising funding, researching resources, and connecting with SDS families everywhere, and has not stopped ever since. Her drive and creativity have inspired countless other families to engage and she is an unstoppable positive driving force toward therapies and cures for people with SDS everywhere. 

In her role at the SDS Alliance, she helps find and support new SDS families, identify and offer new resources for families, and develop family educational materials and events.

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