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

Kevin Johnson, Chief Executive Officer

KJohnsonKevin Johnson is the Chief Executive Officer at United Allergy Services. Before taking on the position as CEO, he sat as a UAS board member for almost two years. Kevin has the robust operating experience needed to lead a large scale business. He has more than 30 years of experience with healthcare diagnostic laboratories, including executive leadership positions with Quest Diagnostics, Inc. and DIANON Systems, Inc. During his 18 years with Quest Diagnostics, he held numerous management and executive level positions. Following his position at Quest Diagnostics, Kevin joined DIANON Systems, Inc., the preeminent cancer diagnostic services company offering specialized anatomic pathology and molecular genetic testing services to physicians nationwide. He served as president, CEO and chairman of the board for DIANON Systems, Inc. until January 2003. Currently, Kevin serves on the Boards of NeoGenomics, Inc. and ClearPath Diagnostics, a private company.

IMG_1738Dr. Frederick Schaffer, Chief Medical Officer

Dr. Fredrick M. Schaffer is Chief Medical Officer 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.


Becky McBMcEuenEuen, Chief Human Resources Officer

Becky McEuen is the Chief Human Resources Officer 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.


TThillThomas Thill, Senior Vice President of Operations

Thomas Thill is the Senior Vice President of Operations 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.

JThresherJohn Thresher, Vice President of Sales

John Thresher is the Vice President of Sales and is responsible for the training, strategy and direction for the sales organization. Previously to this position John was a Regional Sales Manager for UAS. John has more than 15 years of experience in leadership, operations and sales. He has held positions at KCI, Stryker Medical, and Johnson & Johnson. John also served as a U.S. Army aviator for eight years, commanding multiple units and flying the UH-60 Blackhawk helicopter. Most recently he was the Vice President of Regional Development at Airrosti Rehab Centers where he was responsible for all operational and marketing functions for a large group of healthcare providers in Texas. He received a bachelor’s degree in Engineering Management from the United States Military Academy.

BNelsonBerkley Nelson, Vice President of 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.