About Us

About United Allergy Services

United Allergy Services exists to empower providers and advance the understanding of immunotherapy as the gold standard of allergy treatment. We’re headquartered in San Antonio, Texas. In just eight years, we’ve grown to more than 635 employees, and work with more than 2,400 practitioners across 20 states. During that time, we’ve conducted more than 400,000 allergy tests and served over 250,000 patients with over 26 million immunotherapy treatments administered — 83% of those being done in the patient’s home.

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 United Allergy Services, Tom has also been the head of Marketing, and the Vice President of Strategic Sales and Marketing. Prior to joining United Allergy Services, 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 United Allergy Services, 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.

Dr. Frederick Schaffer, Chief Medical Officer

dr frederick

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.

Berkley Nelson, Vice President of Business Development & Payor Relations

B Nelson

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 United Allergy Services 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 Brigham Young University in Provo, Utah.

Rich Lewis, Chief Financial Officer

Rich-LewisRich Lewis is the Chief Financial Officer for United Allergy Services and is responsible for overseeing all Accounting, Finance, Revenue Cycle, Legal and Compliance matters. Rich brings more than 20 years of experience in Healthcare Finance and Operations management to United Allergy Services. Prior to United Allergy Services, Rich worked at 21st Century Oncology where he held several positions of increasing responsibility in finance and operations culminating in his last role as CFO. Prior to 21st Century Oncology Rich was the Director of Cost & Budget and Director of Billing for Anthem Blue Cross and Blue Shield. In addition, Rich has extensive experience in mergers and acquisitions, risk management, information warehousing and analytics. Rich earned his BSBA degree from The Ohio State University and his MBA degree from the University of Pittsburgh.

Mike McCollum, Chief Operating Officer

Mike-McCollumMike is our Chief Operating Officer, responsible for leading field operations. Mike brings more than 13 years of healthcare experience in senior leadership positions. Before joining United Allergy Services, Mike held positions of increasing responsibility in operations, sales, marketing, finance and acquisitions with companies like Essilor, Humana/Concentra, GE, CitiGroup, and The Associates. Previously he served on the VisionWeb board of directors. He holds a BA in Accounting from Texas Tech University, an MBA from Southern Methodist University, and is a Certified Public Accountant.

Hugh Spires Jr., Corporate Counsel

HughSpiresHugh is the Legal Affairs Director and Corporate Counsel. He is responsible for advising executive leaders and senior management on various legal and strategic business projects. He collaborates with the sales, finance and operations teams to negotiate and establish new vendor contracts, and advises on regulatory, operational and transactional matters, including the Anti-Kickback statute, Stark law, HIPAA, and physician contracting. Hugh brings more than 20 years of experience as a trial attorney and general counsel in the healthcare field. Before joining United Allergy Services, Hugh defended multi-million-dollar medical malpractice cases, represented clients in labor arbitrations and employment hearings, prosecuted criminal cases, and served as senior general counsel to the second largest medical center in the Air Force and 14 smaller hospitals. Hugh has also served as a legal advisor to the Air Force Surgeon General’s Office and a litigation attorney for the Texas Medical Board. Hugh earned his undergraduate degree from the University of Louisiana at Monroe (formerly Northeast Louisiana University) and his J.D. from the University of Arkansas at Fayetteville.


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 United Allergy Services 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


United Allergy Services is proud to be affiliated with the following organizations.

Academy of Allergy and Asthma in Primary Care Better Business Bureau

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 United Allergy Services.

RISE-UP Values


  • understand customer expectations and go out of our way to meet them;
  • treat people as we would like to be treated;
  • have self-respect from knowing we have put forth our best efforts.


  • do what we say we are going to do;
  • do the right thing, even when no one is looking;
  • deliver our best in all we do;
  • accept responsibility for our actions.


  • are precise, consistent and accurate in all we do;
  • adhere to all Clinical Standard Operating Procedures.


  • value continuous learning;
  • display adaptability and embrace change;
  • are the allergy experts our partner physicians and patients depend on.


  • work together to consistently drive results and meet our goals;
  • believe succeeding as an enterprise is more important than succeeding individually;
  • are open to hear other’s feedback, strive to continuously improve.

Positive Energy

  • embrace challenges and work to overcome them.
  • make an impact.
  • are energized by our mission.
  • choose a positive attitude.
  • celebrate success, recognize and reward the achievements of individuals and teams.


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 United Allergy Services 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

*Sources 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.