About Us


Keeping the World Activ

At Activbody, we believe everyone has the potential to improve their physical health and overall well-being.


Our Mission

Activbody is dedicated to revolutionizing the way we think about strength, health, and rehabilitation. Our goal is to leverage data and technology to help people be more active anywhere, anytime. Together, we can build a stronger, healthier world.

Our Founder

Finding it difficult to make time for the gym, our founder, Dr. Kosta Yanev, invented the Activ5 to keep himself fit and healthy despite the demands of his busy life. Dr. Yanev needed a portable, flexible solution. He needed a way to get a full body workout anytime, anywhere, and he wanted to be able to track his progress. The Activ5 was designed with these goals in mind. To date, the Activ5 is the most effective, connected, pocket-sized strength training device on the market.

Our Team

Founder Kosta Yanev

Kosta Yanev
Chairman, Founder

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Kosta Yanev is the inventor of Activbody’s exercise system and the company’s founder. Prior to building this company, he wanted a device that would help him integrate daily exercises into his busy schedule. Kosta is a nuclear physicist and holds a Ph.D. in computer science. He has worked at CERN in Switzerland and has founded and launched numerous successful businesses including FTSAM (airport development), Great Bear (GTBR), Company for Energy Saving (JV with RWE – Germany), DONTNOD Entertainment (Paris), Shibuya Productions (Monaco) and now Activbody.

Dan Stevenson

Dan Stevenson
Chief Executive Officer

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Dan brings more than 25 years of technology and eCommerce expertise to his role as CEO of Activbody. Armed with a vision to expand Activbody’s mission to make the world a healthier place through fitness and rehabilitation technology, Stevenson is driving the company’s trajectory of rapid growth into new channels globally. Prior to joining Activbody, Dan held leadership roles at companies spanning from start-ups to Fortune 500 brands, including Apple, Sony, Gateway and VSP Global. Stevenson earned an MBA from Harvard Business School and a BS from Purdue University. A former competitive long distance runner, Stevenson unites his passions for fitness and technology under one roof here at Activbody.

CPO Angel Vassilev

Angel Vassilev
Chief Product Officer

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For over 8 years, Angel has been ActivBody’s co-inventor and product leader, contributing through vision, ideology, product conception, design and implementation management. On this course, he has lead our R&D team to a Best of CES nomination and our recently launched program with the Pittsburgh Steelers NFL team, introducing ActivBody into the world of high-performance athletics and sports. Before starting with ActivBody, Angel spent 17 years at the intersection of humanities and technology, over products as diverse as video games and airport designs. One such product is espresso, that he introduced to the company in the self-proclaimed capacity of Chief Espresso Officer, and co-founder of the ActivBody Espresso Club. This product is still subject to rigorous tasting and perfecting.

Mike Hershkovitz

Mike Hershkovitz
VP, Global Sales & Marketing

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Mike leads Activbody’s global sales and marketing team. Mike brings more than 20 years of experience developing and executing sales strategies for large international corporations in various industries, including medical devices, healthcare, software, finance and telecommunications. Prior to joining Activbody, Mike built and led high-performance sales teams and managed business divisions in companies, such as Johnson & Johnson Medical Devices, QualiTest Group, Excedo Ventures, Improve Comikaza and Taldor. Mike earned a B.A. in Management and Communication from The College of Management Academic Studies in Tel Aviv, and an M.B.A. from The Coleman University in San Diego. When he’s not moving product, he’s on the move chasing his two kids around.

Jason Liebrecht
VP of Software Development and Engineering

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Jason rode into Activbody on his mountain bike with over 25 years of experience working with Software Engineering and Information Systems, from “hands-on” to management roles. Jason leads a small development team composed of staff, contractors, and off shore teams. He has an extensive background in many aspects of technology management, with experience in software development as well as out of the box deployments. He has focused primarily on full stack web development using both Agile and Waterfall methodologies to lead Application Development, QA, Deployment, and Support. In true engineer fashion, Jason enjoys junk food and nerdy graphic tee’s.

Alison Fay

Alison Fay
Sr Director of Product

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Alison is a Product Leader with a passion for exceptional user experiences. She is known to be a highly analytical thinker with the ability to adapt product strategy to business vision. She has been the Product lead for more than 10 connected devices as well as a video-on-demand service available on over 20 million connected devices, set-top boxes, tablets, and phones. She recently returned to San Diego after spending several years in New York as a VP of Product at XO Group (NYSE XOXO). A retired triathlete, she clocks most of her miles these days running after her 4-year-old son.

Sarah Domurat

Sarah Domurat
Sr Director of Global Marketing

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Sarah is the head of our marketing department at Activbody and is super passionate about advocating health and wellness on a regular basis. She’s made successful contributions in a number of physical therapy, athletic training, and wellness roles. With advanced degrees in exercise, nutrition, and dietetics, she has had the opportunity to merge her background with her business skills to become a highly accomplished marketing and product management professional. Sarah is a SoCal native with an excellent carbon footprint as she likes to commute to the office by bike.


Ludmil Kalaydjiyski
Sr Director of Engineering & QA

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Ludmil has a PhD in Computing and BEng degree in Automatic Control with over 26 years of engineering experience and has been working for Activbody in the area of portable fitness devices in the last 7 years. He is responsible for Technical and QA supervision of the full product life cycle for the Activ5 Strength Training Devices: from requirements to production, all engineering, quality, process, and test activities, including manufacturing stage, and management of device Certification. Ludmil is also responsible for managing end-to-end Quality Assurance for all Company products. When he’s not behind a screen or two, his hobbies include weight training and swimming.

Jon Tait

Jon Tait
Director of Operations

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Jon is a talented multitasker as he leads both logistics and customer care at Activbody. Previously, Jon took a family business from a garage to national retail distribution, where he ran operations and sales. He also served as chief of staff for a private investor. Jon is a South Dakotan who earned a Bachelors in Business Administration with an emphasis in Economics and Finance. When he’s not fulfilling Amazon POs, Jon enjoys boxing, hiking, camping, and stock trading. He also appreciates cooking delicious meals for his loved ones and aims to travel to as many destinations on his bucket list as he can.

Kristal Yu

Kristal Yu
UX/ UI Designer

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Kristal is our ambidextrous UX/UI designer. Kristal’s background in cognitive science gives her unique insights into human perception and interaction which helped her become an analytical and empathetic designer. She is passionate about using design to solve problems and create user-centered products to improve lives. She was born and raised in the Golden State, where she earned her degree from the University of California, San Diego followed by a quick stint in Chicago. She likes to keep herself busy with things that excel her in life. In her free time, she enjoys exploring new opportunities and destinations.

Brittany Cavallo

Brittany Cavallo
Marketing Coordinator

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Brittany supports our marketing efforts at Activbody and is the President of our office espresso club. She is the pillar for our promotions and campaigns yet finds time for coffee bean quality control. Additionally, her love for travel coincides with her trade show support and global marketing groundwork. With a little under a decade of experience working for several different agencies and brands, Brittany is both creative and adaptable to all industries. She earned her degree in Advertising & Marketing Communications from Johnson & Wales University in Providence, RI. As an East Coast transplant, Brittany is happy to pay the sunshine tax and enjoys working from the office patio.

Allie Pompeo
Office Coordinator

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Allie straight up runs the office here at Activbody. She knows her way around a Trello board and has a keen eye for K-Cup selection. As a SoCal native, she evidently enjoys being outside year-round and partakes in activities such as hiking & traveling. Allie graduated from California State University, Fullerton with a degree in Communications. She’s been working with beauty & wellness brands since 2015, gaining experience in a variety of fields such as marketing, PR & event coordination. Her passion for fitness, nutrition, and wellness coincide with who we are; making her the ideal head of our quarters.

Michael Price
GM, Activbody U.K.

activbody Michael Price

Michael is our GM across the pond. He has over 30 years of experience in manufacturing, international sales and marketing in the electronics, consumer electronics, wireless technology and IT markets. For the past 16 years, he has been a partner in P&P Business Development that provides business development consultancy services to clients that range from large global technology companies to SME’s and start-ups. Michael has held board level positions with four companies. He has been mentoring CEO’s of Edinburgh based companies as part of the Edinburgh Chamber of Commerce mentoring program for the past 4 years. He holds Masters and Bachelor of Arts Degrees in Economics. In his free time, he enjoys going for a run or attending a classical musical concert.

Noelle Green
Customer Service Manager

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Noelle is our highly personable and accountable Customer Service Manager who joined us with just over a decade of customer service experience. She’s a SDSU graduate with a bachelor’s degree in Economics and minor in television, film, and new media. She excels at listening and responding to our customers in a timely and positive manner. She strives to win and maintain customer success through acquisition, expansion and retention efforts. When she isn’t giving our customers her undivided attention, you can find her out on a hike, trying a new wine or curled up with her cat.