Meet the Team

The Cincinnati Center for Eosinophilic Disorders (CCED) is home to specialists with a wide variety of backgrounds and areas of focus. As a team, this diversity makes us better prepared to care for the unique needs of each patient and to conduct leading research. Learn more about our clinical research team below and our clinical care team.
A photo of Marc Rothenberg.

Marc E. Rothenberg, MD, PhD Director, Division of Allergy and Immunology

is focused on elucidating mechanisms of allergic responses, especially in mucosal tissues such as the lung and the gastrointestinal tract, in order to identify novel pharmaceutical targets for treatment of patients with eosinophilic diseases including eosinophilic gastrointestinal disorders, hypereosinophilic syndromes and asthma and food allergies. Lab has identified and characterized several critical pathways that regulate allergic responses. 

Visit the Rothenberg Lab website.


A photo of J. Pablo Abonia.

J. Pablo Abonia, MD Interim Director, Registry for Eosinophilic Disorders (REGID)

assesses the biology and regulation of mast cells and their role in disease such as eosinophilic esophagitis and primary mast cell disease. Conducting translational research and clinical trials and developing patient databanks and bioinformatic approaches to understanding allergic disease. Sees patients at the Cincinnati Center for Eosinophilic Disorders. Involved in the national Registry for Eosinophilic Gastrointestinal Disorders (REGID).

A photo of Margaret Collins.

Margaret H. Collins, MD

is a pediatric pathologist specializing in pediatric gastrointestinal pathology, especially eosinophilic gastrointestinal diseases. She has provided biopsy analyses, including primary study endpoints, for several clinical trials testing novel therapies to treat eosinophilic esophagitis in children. She also performs clinical research in other disorders of bowel immunity, and bowel motility disorders.

A photo of Patricia Fulkerson.

Patricia C. Fulkerson, MD, PhD

researches the biology of the eosinophil-lineage committed progenitor (EoP). Aiming to identify novel therapeutic targets to block eosinophil production for the treatment of patients with eosinophilic disorders, she investigates transcriptional regulation of EoP generation and identifies/characterizes pathways important for EoP survival, proliferation and differentiation into mature eosinophils.
Visit the Fulkerson Lab.

A photo of Simon P. Hogan.

Simon P. Hogan, PhD Director of Research, Division of Allergy and Immunology

is studying allergies, food allergies, eosinophil biology, and gastrointestinal inflammation.
Visit the Hogan Lab.

A photo of Leah Kottyan.

Leah C. Kottyan, PhD

studies the molecular and immunological mechanisms driving the statistical association of genetic variants with systemic lupus erythematosus and eosinophilic esophagitis. The goal of her research is to refine the statistical analysis of genetic data while using analytical and biological tools to predict and confirm genetic variant-dependent differences that affect gene expression, cell function, and disease risk.

A photo of Vincent Mukkada.
A photo of Philip Putnam.

Philip E. Putnam, MD Director, Endoscopy Services

is interested in the clinical diagnosis and treatment of eosinophilic gastrointestinal disorders. He is the medical director of the Cincinnati Center for Eosinophilic Disorders. He is also taking part in the Aerodigestive and Sleep Center, a multidisciplinary group including ENT, pulmonary medicine, and pediatric surgery, which evaluates and treats children who have complex disorders involving the airway and gastrointestinal tracts.

A photo of Kimberly Risma.

Kimberly A. Risma, MD, PhD Director, Allergy and Immunology Fellowship Program

is focused on the molecular and cellular bases of primary disorders of immune deficiency and dysregulation, especially as it relates to lymphocyte cytotoxicity. She studies the pathologic consequences of missense mutations in perforin identified in patients with hemophagocytic lymphohistiocytosis (HLH) and strives to develop novel therapies through gene therapy or small molecule chaperones.
Visit the Risma Lab website.

A photo of Ting Wen.

Ting Wen, PhD Researcher, Cincinnati Center for Eosinophilic Disorders

investigates the molecular mechanisms of eosinophilic esophagitis (EoE). His lab's studies focus on identifying novel disease-causing genes and related pathogenic pathways. His research utilizes genome-wide analysis and cutting-edge techniques to provide molecular insight into the pathogenesis of EoE and allergy. Investigating basic eosinophil biology with human samples and mouse models is also an ongoing research interest.

A photo of Nicole Zahka.

Nicole E. Zahka, PhD Staff Psychologist II, Behavioral Medicine and Clinical Psychology


Our center's Manager, Research Associates/Dietitian and Clinical Research Coordinators are an integral part of the CCED research team.

Center Manager

Julie Daisey, MS
CCED Manager

Research Associates / Dietitian

Carina Venter, PhD, RD
Research Associate/Dietitian

Kara L. Kliewer, PhD, RD
Research Associates 

Clinical Research Coordinators

Melissa Caldwell, BA
Clinical Research Coordinator 

Tal Cohen, MS
Clinical Research Coordinator

Melody Hess, MS
Clinical Research Coordinator

Jonathan Kuhl, BS
Clinical Research Coordinator

Kira L. Rehn, BS
Clinical Research Coordinator