Our Team


Oral Alpan, MD

Chief Executive Office and Chief Medical Officer

Oral Alpan, MD, is the Lab and Medical director of Amerimmune, LLC, CEO and Medical Director at O&O Alpan, LLC in Fairfax, Virginia, and Associate Professor of Pediatrics at Virginia Commonwealth University’s Inova Campus in Falls Church. He received his medical degree from Hacettepe University Faculty of Medicine in Ankara, Turkey. Dr. Alpan continued his education with an internship and residency in Pediatrics at Stony Brook University in New York and a fellowship in Allergy/Immunology at the National Institute of Allergy and Infectious Diseases in Bethesda, Maryland. Board-certified in Allergy and Immunology, Dr. Alpan is a member of the American Academy of Allergy, Asthma & Immunology. He is a Principal Investigator on numerous research studies in the field of immunology asthma and allergic disorders, and he has published a number of articles and abstracts in peer-reviewed journals.


Matt Plassmeyer, PhD

Laboratory Manager

Matthew Plassmeyer, PhD, graduated from George Mason University in 1998. He obtained his graduate training in Cell and Molecular Biology at the University of Pennsylvania examining viral neuropathogenesis, 2005. Following graduate school, he performed his doctoral training at the NIH with Dr. Louis Miller studying the mechanisms of malaria parasite invasion of erythrocytes. In 2006, under Dr. Miller, he managed the malaria antigen research section and was responsible for the small-scale production and investigation of new malaria antigen vaccine candidates. In 2010 he joined Polybatics, a small startup company in New Zealand that developed functional bioengineered polymer beads, as the project manager.


Soren Sonder, PhD

Senior Scientist

Soren obtained his PhD in 2006 from the University of Copenhagen, Denmark, where he studied NF-kB signaling to improve the understanding and treatment of inflammatory response in humans. He continued his career specializing in immunology as a postdoctoral researcher at NIH investigating IL-17 and NF-kB signaling and at Johns Hopkins studying gene expression in human CD4 memory cells. Soren joined O&O Alpan LLC and Amerimmune LLC in 2014. Since he joined the company he has published peer reviewed clinical and technical flow cytometry papers. He is currently a project manager and senior scientist with Amerimmune LLC and O&O Alpan LLC, focused on multiple CRO and translational clinical immunology projects using flow cytometry to improve healthcare and well-being for patients with immune deficiencies.


Denise Loizou, RN

Director of Client Services

As a mother of children with severe food allergies, Denise was all-too-familiar with sudden life-threatening moments. The need to educate and advocate became a compelling force that laid the groundwork for her role at Amerimmune. Denise has been working with Dr. Alpan since 2007. She quickly discovered another passion: educating and assisting others facing chronic immune issues, whether severe allergy, Eosinophilic Esophagitis, or Primary Immunodeficiencies. Her interest and drive are compelled by the need of patients and healthcare providers to manage disorders that are often misunderstood.

Throughout her career, Denise coordinated multi-disciplinary clinics for patients with eosinophilic disorders; she launched the first, and assisted in subsequent annual educational forums (CME events) for healthcare providers to gain a more complete understanding of immune disorders; and she has served as a liaison on behalf of iCurbConsult to the medical community.

Denise is currently involved in expanding the reach of Amerimmune to local and national medical practitioners. She wants to ensure doctors have a simple, reliable and beneficial means of identifying immune disorders within their practice.