Client Success Stories

Learn About Microbiology

Antimicrobial Test Laboratories - Staff

The many people who work at Antimicrobial Test Laboratories are intelligent, professional, and helpful. Our clients can count on them to help speed their projects from start to finish.

  • Benjamin Tanner, Ph.D. | President and CEO
  • Gina Tanner, M.B.A. | Business Manager
  • Jason Williams, B.S. | Team Lead for Custom, Device, and Aerosol Testing
  • Nicholas Garcia, B.S. | Team Lead for Disinfectant and Sanitizer Testing
  • Benjamin Grosse-Siestrup, Ph.D. | Team Lead, Antimicrobial Surfaces & Textiles
  • Nicole Goulding, B.S. | Team Lead for Virology
  • Alex Bienko, B.S. | Quality Assurance Specialist
  • Diego Ugarte, B.S. | Microbiologist
  • Blake Rolland, B.S. | Microbiologist
  • Katelyn Hammond, B.S. | Microbiologist
  • Eric Cuellar, B.S. | Microbiologist
  • Rachel Bullock, B.S. | Microbiology Associate
  • Bridgette Garzonie, B.S. | Microbiology Associate
  • Erika Guin, B.S. | Microbiology Associate for Virology
  • Alex Vasquez, B.S. | Microbiology Associate
  • Megan Rutland, B.S. | Microbiology Associate
  • Kimberly Korn | Accounting Clerk
  • Shan Mahmood | Microbiology Intern
  • Krystal English, B.S. | Microbiology Intern

Benjamin Tanner is co-owner, President, and CEO of Antimicrobial Test Laboratories. He holds a Ph.D. in Microbiology and Immunology from the University of Arizona, where he studied infectious disease transmission by aerosols with Dr. Charles Gerba.

He founded Antimicrobial Test Laboratories with his wife in 2006 after enjoying years as a microbiologist with The Clorox Company. Since then he has overseen thousands of antimicrobial efficacy studies for industry, academia, and government.

Dr. Tanner wrote the book "Legal Aspects of Infectious Diseases" and routinely serves as an expert in litigation related to microbial contamination and infection. He enjoys helping parties on both sides of litigation understand the microbiological phenomena central to their disputes.

Dr. Tanner spends most of his time working with the laboratory's clients to ensure the success of their projects and working one-on-one with Antimicrobial Test Laboratories' proficient staff.

"Being part of Antimicrobial Test Laboratories' growth has been incredible. Together with our clients, we have created great jobs for over a dozen microbiologists, helped amazing products to succeed in the marketplace, and become known as a responsive, competent commercial partner. Our goal for 2014 and beyond is simple: Build our position as the very best laboratory for antimicrobial testing."

Dr. Tanner takes part in the following organizations:

Dr. Tanner talks about nursery hygiene on the Today Show:


Gina Tanner is the co-founder, co-owner, and business manager of Antimicrobial Test Laboratories. She holds a B.S. in Finance from the University of Arizona and an MBA. Prior to taking her role at the laboratory, Gina worked in sourcing, marketing, and finance for Safeway, Inc, and was an accountant for Honeywell, Inc.

Gine ensures the company runs smoothly and systematically in order to produce a consistent, valuable service for its clients. She often leads special laboratory projects, such as the recent installation of a massive solar panel array on the facility's roof.

"I want innovators to feel comfortable exploring the possibilities of their technologies at Antimicrobial Test Laboratories. To that end, I spend my days streamlining lab-client interactions, maintaining our fast test-turnaround times, and making sure our customers are satisfied with their testing experience."

Jason Williams is Team Lead for Custom, Device, and Aerosol testing at Antimicrobial Test Laboratories. He holds a B.S. in Microbiology from Texas Tech University. His previous work experience includes USDA, where he studied virulence and pathogenesis of hemorrhagic E. coli. Prior to joining Antimicrobial Test Labs, he served in the United States Marine Corps, where he was a two-time recipient of the Navy and Marine Corps Achievement Medal.

Jason has been with Antimicrobial Test Laboratories since 2009. He plays a key role in laboratory operations and manages many high-profile projects.

“We may never win the war against pathogens, but we can pick our battles through the prudent use of effective antimicrobial products. I am excited to take part in optimizing the effectiveness of antimicrobials and disinfectants produced by today’s leading and largest consumer product manufacturers."

Nicholas Garcia is the Team Lead for Disinfectant and Sanitizer Testing at Antimicrobial Test Laboratories. He holds a B.S in Biomedical Science from Texas A&M University. Before joining Antimicrobial Test Laboratories, Nick worked at a cutting-edge biotechnology company on assay devlopment, then as a cGMP quality and validation specialist for a global pharmaceutical company.

He served the lab as a Quality Assurance Specialist for several years, where he ensured scientific quality by employing his solid understanding of GLP regulations, official ASTM and AOAC test methods.

Now Nick oversees all disinfectant and sanitizer testing conducted at the laboratory, supervising a staff of several microbiologists. His quality assurance and microbiology experience provide the perfect background to aid customers as they conduct studies within on heavily-regulated disinfectant and sanitizer products.

Benjamin Grosse-Siestrup completed his Master's studies in microbiology in 2006 at the University of Würzburg, Germany. He then moved to the US, where he earned a Ph.D. in Infectious Diseases from the University of Georgia, studying gene regulation in Mycobacterium tuberculosis, the causative agent of tuberculosis.

Dr. Grosse-Siestrup brings several years of experience working in high containment laboratories to Antimicrobial Test Laboratories.

Ben is the Team Lead for Antimicrobial Surface and Device Testing at Antimicrobial Test Laboratories, supervising a staff of several microbiologists who conduct assays such as AATCC 100 and JIS Z 2801. In addition, he is the lab's resident Mycobacterium expert and plays a supervisory role in the conduct of tuberculocidal efficacy studies.

His scientific acumen fits well within the company. His natural interest in business coupled with his interest in antimicrobial technologies is a great asset to colleagues and customers alike.

"In 1969, after the discovery of penicillin, US Surgeon General William H. Stewart said 'The time has come to close the book of infectious disease.' Today we know that this time has not come and maybe never will. However, by supporting the development of new antimicrobial agents, we can try to shift the battles with the microbes in our favor."

Nicole Goulding holds a B.S. of Biological Sciences from the University of California at Santa Barbara. Prior to her work at Antimicrobial Test Labs, Nicole worked for Genentech, where she assisted in the production of commercial and clinical therapeutics.

Nicole was trained by Dr. Luisa Ikner in Antimicrobial Test Laboratories' virology lab and now serves as Team Lead for virology. She supervises a staff of virologists and is responsibile for maintaning virus and cell cultures as well as supervising all virucidal efficacy testing done at the laboratory. Her detail-orientation, work ethic, and easy-to-work-with personality are an asset to the company.

Alex Bienko is the Quality Assurance Specialist at Antimicrobial Test Laboratories. He holds a B.S. in Biotechnology from the University of Houston.

Alex has a keen eye for detail and his specific course work pertaining to cGMP/GLP and QA/QC is a major asset to the lab and its clients.

In addition to his cGMP/GLP education, he was trained by Nicholas Garcia, former Quality Assurance Specialist for Antimicrobial Test Laboratories and current team lead for Disinfectants and Sanitizers.

Alex audits and oversees all GLP studies, conducts routine facility audits, and works closely with test facility management to ensure compliance with GLPs. His easy-to-work-with personality and work ethic are an asset to the company.






Diego Ugarte holds a B.S. in Microbiology from the University of Texas at Austin. Prior to joining Antimicrobial Test Laboratories, Diego worked in sample collection and testing of Methicillin-resistant Staphylococcus aureus (MRSA) samples at New England Baptist Hospital in Boston, Massachusetts. His MRSA experience is a great asset to the company.

Diego is also fluent in Spanish, his native tongue, and brings chemistry knowledge to the lab through experience in pharmaceutical studies.

Blake Rolland holds a B.S. in Microbiology from the University of Oklahoma. Blake has a genuine interest in microbiology and pathogenesis. The benchtop laboratory experience he gained while studying under a number of prestigious professors assists him in executing a number of the test methods offered by Antimicrobial Test Laboratories.

Katelyn Hammond holds a B.S. in Microbiology from the University of Texas, Austin.

Katelyn has become an expert with regard to several standardized and custom test methods, ranging from AOAC Use-Dilution tests to custom studies on room-disinfecting ultraviolet light devices.

She is especially detail-oriented and excellent with regard to conducting studies in a careful manner that removes some of the variability from antimicrobial testing. Customers also enjoy her prompt study communication and keen technical insights.


Eric Cuellar holds a Bachelors of Science degree in Microbiology from the University of Texas.

He is well-versed with regard to a variety of microbiological test methods and procedures. As a Microbiology Associate at Antimicrobial Test Labs he has proven himself to be reliable and thorough in every study he conducts. His calm demeanor and acute attention to detail make him a pleasure when engaging with clients.




Rachel Bullock holds a Bachelors of Science degree in Microbiology from Texas State University.

She has a strong and varied technical background and a keen attention to detail in her work. As a Microbiology Associate at Antimicrobial Test Laboratories, she takes part in a wide array of studies and test methods.

Rachel's goal in the lab is to see her projects through to completion with the utmost quality. Her professional attitude and drive to produce excellent work make her an asset to the laboratory and clients alike.



Bridgette Garzonie holds a Bachelors of Science in Biology from the University of Texas at Austin.

She is very dedicated and hard working with a strong attention to detail in every study she conducts. As a Microbiology Associate at Antimicrobial Test Laboratories, she participates in a broad array of studies, working closely with other microbiologists to ensure the integrity of every study. Her client service skills and cheerful personality make her an effective partner to companies conducting antimicrobial testing.


Erika Guin holds a Bachelors of Science degree in Biology from St. Edward's University. She has a strong educational background in microbiology, and is a dedicated and enthusiastic professional.

As a Microbiology Associate at Antimicrobial Test Labs she has assisted other microbiologists in the conduct of a wide range of both standard and custom studies.

Her strong work ethic, positive attitude, and interest in comprehensive and accurate testing make her an asset to the laboratory as well as a competent conductor of antimicrobial studies.



Alex Vazquez holds a Bachelors of Science in Microbiology from the University of Texas at El Paso.

As a Microbiology Associate at Antimicrobial Test Laboratories, he assists other microbiologists in the conduct if various studies and is proficient in several test methods.

His strong work ethic, attention to detail, and superior customer service skills make him an asset to the laboratory.








Megan Rutland holds a Bachelors of Science Degree in Microbiology from the University of Oklahoma. As a microbiology associate at Antimicrobial Test Laboratories, she takes part in a broad range of studies.

She has a strong work ethic, excellent attention to detail, and an genuine interest in seeing her studies through to successufl completion.



Kimberly Korn brings over a decade of bookkeeping experience from the medical manufacturing and aerospace industries to her work at Antimicrobial Test Laboratories. Her contribution to the business side of the laboratory ensures projects don't get held up in accounting.

She also supports the lab and the scientists by performing many general office functions. Her cheerful, “customer first” attitude will brighten your day.

"Success is a journey, not a destination. Let's make the most of our journey."

Shan Mahmood is currently a student at the University of Texas at Austin, studying Microbiology.

He learns quickly and has already established a solid academic knowledge base. Coupled with the hands-on experience he has gained through the course of being an intern at Antimicrobial Test Laboratories, Shan is poised for a fantastic career as a microbiologist.




Krystal English holds a Bachelor of Science degree in Biology. She works as a microbiology intern at Antimicrobial Test Laboratories and as a technician at Cosmetic Test Labs.

She is well versed with regard to cosmetic test methods such as preservative challenge tests, standard plate counts, and stability testing. She assists both laboratories on a daily basis.