Partnering to provide software development and data science services to bring your ideas to reality

We provide the technical skills to take on the opportunities you see.
You have a software and/or data related idea, and we've got the expertise to get you there.

Learn more about partnering with us

Our Story

Based in Louisville, KY, Doorn was founded in 1999 by Lee Hagendoorn, MBA, a Louisville Business First Top Forty Under 40. Originally known as Advertek, Inc, Lee created the company to solve problems based on his background in math and computer programming.

In one of our earliest projects, we met with a team requesting data management and reporting assistance at a University of Louisville research lab, and found an unexpected participant upon arrival. A young cow on a treadmill, who was testing the first totally implantable artificial heart! The project went on to win FDA approval and national exposure, and the heart can be seen at the Smithsonian's National Museum of American History.

Since the success of the artificial heart project, Doorn has continued to design and develop systems to help organizations meet their goals in the Louisville area, regionally, across the US, and supports users around the world. We now consist of an amazing team of experts in data science, software engineering and business.

We work with research organizations and organizations in the healthcare industry such as Norton Healthcare, the James Graham Brown Cancer Center, and the University of Louisville, along with collaborative organizations with member hospitals and clinics throughout the US such as the Society of Gynecologic Oncology and the Registry for Performance and Clinical Outcomes in Radiosurgery.

Our solutions and services have led to statistics published in major journals including the Journal of Clinical Oncology and American Journal of Surgery.

We also provide data science and software engineering services to organizations in other industries.

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Our Values

  • Partnership Icon Partnership

    Our goal is to help you succeed. We want to provide a solution that meets your needs, so we learn your goals and make them ours.

  • Friendliness Icon Friendliness

    We believe you'll have a difficult time finding a company with people more upbeat to work with. It's part of our culture.

  • Responsiveness Icon Responsiveness

    A key component of our business is support. We won't keep you waiting. If you need something, we'll get it to you - quickly.

  • Usefulness Icon Usefulness

    We want to be useful to you. The services and solutions we provide must align with what you need. A solution is no good if it's not useful.

  • Satisfaction Icon Satisfaction

    We want to be a partner you turn to because you know we'll get you what you need - in a manner that makes you happy to work with us.

  • Trust Icon Trust

    You're trusting us to provide you with what you need, and to keep you secure, up, and running. We don't take that lightly.


Our Leadership

Lee Hagendoorn

Lee founded Doorn in 1999, following a career as a consultant for a growing Boston software consulting firm (acquired by NTT Data). He has provided data science and software engineering services for industry leaders, startups, and universities worldwide.

His 20 years of experience in providing data science and software engineering services allows him to streamline the process of developing a solution by acting as the bridge between the customer team and the technical team. Knowing the language of both business and technology allows Doorn to understand our clients and put solutions in place to work for them best.

Lee has an undergraduate degree in mathematics from the University of Louisville, an MBA from Indiana University, and a professional certification in data science from Harvard University.

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Diana Ash

Diana leads Doorn’s IT architecture, development, and technical support. She is an expert in software design, development, and cloud computing with 18 years of experience in her field.

She has designed and developed iOS, Android, and web-based software for startups, medical providers, corporations, and universities. She has successfully led new development, support, maintenance, and enhancements across all technical tiers of the company’s custom software solutions.

Diana has an undergraduate degree in Computer Information Systems from the University of Louisville and an MBA from Indiana University.

Arny Stromberg

Dr. Stromberg leads Doorn’s data analysis endeavors. He has worked with Doorn for more than 15 years assisting customers with statistical analysis and algorithm development.

Dr. Stromberg is an endowed professor of statistics at the University of Kentucky. He has an undergraduate degree in mathematics from Stanford University and Ph.D. from the University of North Carolina.

Dr. Stromberg is vastly experienced in answering questions with data, from helping physicians solve complex medical questions to helping better anticipate outcomes in sporting events.

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Mike Owens

Mike leads Doorn’s team in developing the user experience. He has worked with Doorn for more than 5 years, organizing customer data into useful, easy-to-follow user interfaces.

Over his career, Mike has provided design consulting for leading companies such as Proctor & Gamble, Microsoft, Humana, and Eli Lilly. He is a graduate of the highly selective, world-renowned University of Cincinnati Design, Architecture, Art, and Planning (DAAP) School of Design Program.

Mike Owens Photo

What some of our customers have to say


  • "Doorn has been exceptional in helping the Department of Surgery meet our data management and analytics goals."
    - Kelly M. McMasters, M.D., Ph.D., Professor and Chair, University of Louisville

  • "I have worked with Doorn for over 10 years and have found their product to be successful in meeting our company needs in providing data tracking and analytics for all our patient care interactions in the cancer support departments."
    - Tammy L. McClanahan, R.N., B.S.N., O.C.N., M.H.A., F.A.C.H.E., System Vice President, Norton Healthcare

  • "As Division Chief of a busy academic service with seventeen surgeons on four services at two locations - I couldn't think of looking after the business side of operations without a tool such as Doorn created. The program has liberated us from pieces of paper and given us immediate accountability. More importantly the utility allows me to gain a sense of how, when and where we are serving our patients and earning a living. I use the tool extensively and find that it is a very powerful tool that I control on behalf of my team to 'own my data'."
    - Jay A. Johannigman, M.D., Division Chief, University of Cincinnati