About United Allergy Services

United Allergy Services exists to empower providers and advance the understanding of immunotherapy as the best kind of allergy treatment.

We’re headquartered in San Antonio, Texas. In just five years, we’ve grown to more than 1,000 employees, and work with more than 3,300 practitioners across 25 states. During that time, more than 10 million allergy tests have been conducted and 14 million immunotherapy treatments have been administered—83% of those being done in the patient’s home.


Our protocols have been developed and are continuously evaluated by the Chief Medical Officer Frederick M. Schaffer, M.D., a board-certified allergist. They are also overseen and evaluated by the UAS Medical & Scientific Advisory Board, which is comprised of:

  • Three board-certified allergists
  • An Otolaryngologist Certified by the AAOA
  • Two primary care providers who serve as medical advisors
  • Two academic doctors from the largest antigen suppliers in the country, ALK Abelló and Jubilant HollisterStier, who serve as scientific advisors


UAS is proud to be affiliated with the following organizations.

AAFP Foundation

Academy of Allergy and Asthma in Primary Care

Texas Osteopathic Medical Association Business Elite Partner

Better Business Bureau

American Osteopathic Foundation

Patient Centered Primary Care Collaborative

Medical Group Management Association

Company Vision and Values


Revolutionize allergy care in America.
We are improving access to millions of allergy sufferers that would not receive advanced allergy care without UAS.


We promise to.
Improve Lives
Create Access to World Class Allergy Care
Deliver Exceptional Service to our Partner Providers

RISE UP Values

respect ourselves.
adhere to all privacy policies and procedures.
work to earn and keep respect, daily.
communicate to all with courtesy, consideration and professionalism.

do the right thing, even when no one is looking.
never cut corners.
communicate openly and honestly.
welcome challenges and make decisions for the good of the company.

never guess. If uncertain, ask.
wear appropriate Personal Protective Equipment and use in manner directed.
are precise, consistent and accurate when providing patient care.
adhere to all Clinical Standard Operating Procedures.

are competent in all areas of Immunotherapy.
are knowledgeable of the UAS business processes.
communicate openly to promote progress and trust.
are committed to the continued education that is required to help develop our skills throughout our career.

communicate in an effort to build a community of trust.
are open to hear other’s feedback and input.
create teams with our fellow employees and with our clinics.
build confidence through our professionalism.

Positive Energy
display professionalism through our appearance and attitude.
express compassion to our peers, patients, and clients.
express enthusiasm through our interaction with others.
are confident and willing to go the extra mile.


The UAS Immunotherapy model has shown:

  • 95% of patients had improved allergic rhinitis scores
  • 82% of patients reported diminished use of medications
  • 88% of patients reported improved Rhinoconjunctivitis Quality of Life Questionnaire scores after IT
  • 86% would recommend allergy testing and immunotherapy to friends and family
  • 82% feel comfortable administering immunotherapy injections
  • 85% of people treated with IT for hay fever may achieve symptom relief within the first year of starting immunotherapy
  • After 3-5 years of complete IT treatment, most patients experience little or no allergy symptoms

Our providers say:

  • 90% would recommend UAS to colleagues
  • 100% believed the CAT/CAS in their practice was knowledgeable about allergy testing and immunotherapy
  • 99% believed the CAT/CAS in their practice interacted well with patients and with clinic personnel
  • 98% believed allergy testing and immunotherapy services are an integral part of patient services

Allergen immunotherapy: A practice parameter third update. Linda Cox, M.D., Harold Neson, M.D. and Richard Lockey, M.D. American Academy of Allergy, Asthma & Immunology. September 23, 2010.

American College of Allergy, Asthma and Immunology. Allergy treatment. Accessed February 1, 2011.

Möller C, Dreborg S, Ferdousi HA, et al. Pollen immunotherapy reduces the development of asthma in children with seasonal rhinoconjunctivitis (the PAT-Study). J Allergy Clin Immunol. 2002;109:251-256.

Provider Survey Results conducted by a third party.

Executive Staff

Thomas Thill, Chief Executive Officer

Tom is the CEO and is responsible for leading all of Field Operations, Clinical Operations, Implementation and Physician Education teams. Tom brings more than 18 years of experience in healthcare across sales, marketing, business development and operations. While at UAS, Tom has also been the head of Marketing, and the Vice President of Strategic Sales and Marketing. Prior to joining UAS, Tom held positions of increasing responsibility in sales, marketing and operations with companies, like Eli Lilly, KCI, Stryker and Pfizer. Tom earned his bachelor’s degrees in Chemistry and Business Administration from Vanderbilt University and a master’s degree in Business from the University of Michigan.



Becky McEuen, Chief Administrative Officer

Becky is the CAO and is responsible for leading the human resources, HR operations, recruiting, training and development teams. Becky brings more than 20 years of experience in human resources, talent acquisition and marketing. Before joining UAS, Becky led the global talent acquisition team at Orbitz Worldwide in Chicago. She also held senior talent acquisition roles at UnitedHealth Group. Her other professional experience includes retained executive search and more than 12 years of agency and client side marketing experience. Becky earned two bachelor’s degrees in English and Economics from the University of California, Berkeley.



IMG_1738Dr. Frederick Schaffer, Chief Medical Officer

Dr. Schaffer is the CMO for United Allergy Services. Dr. Schaffer is board certified in Allergy/Immunology and in Pediatrics. He received a bachelor’s degree in Physics from the City College of New York and received a master’s degree in Nutritional Biochemistry from Columbia University-College of Physicians and Surgeons. He then graduated from medical school at SUNY Downstate Medical College.

Dr. Schaffer completed his residency at Einstein University Hospital from 1981 to 1984 and then undertook his first fellowship at the Hospital for Sick Children/Division of Allergy, Immunology, and Rheumatology at the University of Toronto. Dr. Schaffer completed an additional fellowship at The University of Alabama at Birmingham Division of Developmental and Clinical Immunology and remained at the University as a Senior Research Associate. While in private practice, Dr. Schaffer was also an Assistant Professor of Allergy/Immunologist/Pediatric Rheumatology at the Children’s Hospital of Buffalo and an Attending Allergist at the Baptist Memorial Golden Triangle Hospital in Columbus, Miss. In 2002, he joined the Medical University of South Carolina Pediatrics Department as Associate Professor of Allergy/Immunology and Pediatric Rheumatology. Currently in private practice, Dr. Shaffer is a fellow at the American Academy of Allergy, Asthma and Immunology; the American College of Allergy, Asthma and Immunology; and the American Immunology Association. He is board certified by the American Board of Pediatrics and by The American Board of Allergy/Immunology. Dr Schaffer has participated in more than 25 clinical trials, is widely published, has received numerous awards and is an active symposium speaker.

BNelsonBerkley Nelson, Vice President of Business Development & Payor Relations

Berkley is the Vice President of Payor relations and is responsible for establishing a more proactive relationship with third party payors and working to improve payor communication and processes. He joined United Allergy Services with more than 17 years of progressive sales and business development experience, including significant experience within managed care. Before UAS Berkley worked in the Cardiocom division of Medtronic, where he served as the Vice President of the Health Plan Practice.  He led the development of the non-governmental segment for the division with a focus on payor markets, including ACOs, HMOs, PPOs, TPA’s, trusts, large employers, community health organizations, and other non-governmental payors. Prior to Medtronic, Berkley was Vice President of Sales for Alere Health, a care management company that integrates medical devices and diagnostic services. Berkley also has experience selling consulting contracts and medical equipment to large integrated delivery networks, ACOs and hospitals with Siemens Medical and WM Healthcare Solutions. Berkley has a Bachelor of Science in Biology from Bringham Young University in Provo, Utah.

JLermaJessica Lerma, Director of Legal Affairs & Corporate Counsel

Jessica is the Director of Legal Affairs & Corporate Counsel and is responsible for overseeing all legal matters for UAS. Jessica is responsible for ensuring that UAS operates within state, federal and applicable laws; providing support and assistance to the executive leadership team on various legal and strategic business projects; and offers guidance to all company departments on a variety of legal matters. Previously, Jessica worked in the medical device industry where she worked with KCI’s commercial operations team and was responsible for negotiating medical product distribution agreements, as well as large hospital system service agreements and group purchasing contracts.  Prior to working in a corporate setting, Jessica worked in private practice handling Business Law and Transactions, Civil/Commercial Litigation, Collections and Real Estate. Jessica earned a Bachelor’s Degree in psychology from the University of Texas at San Antonio and a Juris Doctorate degree from St. Mary’s University School of Law.

PGerardPeter Gerard, Chief Compliance Officer & Vice President of Human Resources

Peter is the Chief Compliance Officer and Vice President of Human Resources and is responsible for leading the internal processes for promoting and ensuring United Allergy Service’s compliance with laws, regulations, company policies and contracts, including chairing its Corporate Compliance Committee which oversees its compliance risk management and internal complaint reporting programs.  Peter is also responsible for formulating and implementing UAS’s policies and procedures, including its Code of Conduct, and making sure they are communicated and trained upon across the company.

Peter joined UAS in 2012 as Vice President of Human Resources before becoming Chief Compliance Officer in 2015. Peter brings over 25 years of experience in the areas of human resources, diversity, legal and compliance. Prior to joining UAS, Peter led the human resources team at Heartland Automotive Services, a Blackstone Portfolio company. His other professional experience includes over 15 years of experience with Sodexo Healthcare Services, one of the largest world-wide providers of food and facility services to the healthcare industry. During his tenure, Peter led the Human Resources functions for the Facility Technical Services division. Peter earned degrees in Journalism, English and Business Law from Benedictine University and certification from the Society for Human Resource Management.