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About Us


Hartmut & Filiz Gassmann are the original Importers of the HYLA Air & Room Cleaning System in the United States since 1996. Beginning in a small office located in Greenville, SC, they operated from a single 1,900 sq ft office, building a nationwide, full-operating company.

Within only two years, the business had experienced such growth that they relocated to a larger office in South Florida. Utilizing their expertise in the industry, and with the intentions of optimizing workflow, Mr. & Mrs. Gassmann designed and built the new and final home for the HYLA USA Corporate Headquarters. Relocating to it in 2004, the Headquarters is a prestigious 11,000 sq ft building located in Deerfield Beach, FL.

It not only serves the basic functions of distribution, marketing, administration and customer service, but also provides the HYLA USA network with a home away from home. Mr. & Mrs. Gassmann have since successfully grown their business to include more than 90 offices and 450 associates nationwide, winning their first HYLA International Award in 2001 as Top Importer Worldwide.

Both not only oversee all U.S. Headquarters operations, but also – and most importantly – support their Distributors, Supervisors, and Staff nationwide. Mr. & Mrs. Gassmann have been the sole owners of the HYLA USA Corporate Headquarters since its construction.

HYLA USA Corporate Headquarters

Corporate Headquarters
HYLA USA Monument
Container Delivery

HYLA USA Executives

Hartmut Gassmann, President & CEO

Hartmut Gassmann began his professional career after finishing his military duties and a three and half year apprenticeship as an electronic technician. He spent seven years worldwide working for a company in the technical field, but in order to advance, returned to school and obtained a degree in engineering,

allowing him to work as management in the same company for another two years. Mr. Gassmann then started a new career path in technical sales in Germany, where he was fortunate to make a connection with a company in the automotive industry – a supplier for BMW, Bosch, etc. – who were actively seeking an individual with the technical and sales experience to fill the position of President for their subsidiary in Greenville, SC. He held the position for two years, until embarking on the HYLA journey with his wife, Filiz Gassmann in 1996.

Filiz Gassmann, CFO & Co-CEO

Filiz Gassmann held an apprenticeship in business administration for a company which specialized in business export and import for three years. She began her professional career soon after as a General Manager for an international company selling home textiles, traveling extensively throughout Europe for three years.

She obtained a degree in business administration and moved to the U.S. with her husband, Hartmut Gassmann, working directly with the President of the supplier for BMW. She obtained her real estate license and worked as a housing developer before beginning HYLA USA with her husband in 1996

Stefan Doll, COO

Stefan Doll began his career at HYLA USA, Inc. with an internship in 2006. His consistent motivation and enthusiasm allowed him to quickly acquire the skills and knowledge needed for every aspect of the business, allowing him to be promoted to Chief Information Officer in 2008 and then to Chief Operations Officer in 2010. In addition to working directly with Hartmut and Filiz Gassmann and overseeing the daily office operations, his main focus continues to be information technology, especially the company’s internal database and the HYLA U.S. website.

Prior to his employment with HYLA USA, Mr. Doll worked for various well-known German companies such as Otis and AEG, where his duties ranged from fundamental IT projects to taking the lead role in mechanical and electronic projects for AEG. Mr. Doll holds a master’s degree in computer science from the Technical University of Berlin, Germany.

Troy Baier, National Sales Director

Troy Baier has been in direct-sales since 1996. He was introduced to the HYLA opportunity and began his career with the company in 1998. Through his hard work and dedication to the business he was named Top Distributor in the world in 2000. He was promoted to Assistant Regional Supervisor in 2001 followed by a promotion to Executive Regional Supervisor in 2008 and National Sales Director in 2017.

His goal is to help HYLA USA continue its growth by helping as many people as possible achieve their dreams while maintaining a high-level of integrity and ethics.

Brandon Dunn, National Sales Manager

Brandon Dunn spent most of his career in the restaurant industry, before joining HYLA USA in 2003. He was recruited into the business and started as a dealer. He was then able to open his own distributorship just a few months later. Mr. Dunn was quickly able to grow through the distributor levels, and became an Executive Factory Distributor in 2005. With his hard work, and the great distributors around him, he was promoted to a Regional Supervisor in 2008 and then to National Sales Manager in 2017.

Mr. Dunn’s goal is to continue to help and support other supervisors, distributors, and dealers to continue to pursue their goals, just as he was able too. With the goal of helping HYLA USA be #1 in the world.