Kosta Yanev


Kosta Yanev is the inventor of Activbody’s exercise system and the company’s founder. Kosta is a nuclear physicist and holds a PhD 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

Chief Executive Officer

A seasoned leader with more than 25 years of experience, Dan Stevenson has held leadership roles at companies spanning start-ups to Fortune 500 brands, including Apple, Sony, Gateway and VSP Global. During his tenure at Apple, Stevenson served as Senior Director of worldwide sales support and channel sales for the education division, where he developed and managed a new Campus Sales program that accelerated sales to its highest level in seven years – more than $700 million through campus resellers and agents. At Gateway, Stevenson held the positions of VP of product development and product marketing, VP of direct business, and VP of web where he drove an 800 percent increase in web traffic to retail products, and increased B2B eCommerce sales by 126 percent. He also served as SVP of eCommerce for Sony for more than 6 years, where he expanded business through new Omni-channel integrations, increasing the mix of sales by three times, and driving profit up by 125 percent year-over-year.

Michael “Pyro” Floyd

Chief Operating Officer, Head of Product

Michael “Pyro” Floyd is a seasoned technology veteran with over 25 years of product development, management and operations experience. While at DivX he held various leadership roles including Vice President of Operations and Vice President of Engineering. He also served as the Vice President of Product Management for BitTorrent Inc. where he was responsible for product strategy and development of a suite of products with over 180 million users. Michael has both a Bachelor and Masters degree in Computer Science from SDSU as well as an MBA with a specialization in Globalization from USC.

In his spare time, ‘Pyro’ enjoys being a seasoned Pyrotechnician who has worked on more than 70 fireworks displays, he enjoys coaching Lego Robotics, backpacking and model rocketry.

Seth Cummings

Chief Marketing Officer

Seth Cummings has over 15 years of experience creating and building national brands. He ran digital marketing and mobile content for Boost Mobile (acquired by Nextel). He served as co-founder and SVP at Amp’d Mobile and EVP of Marketing and GM of Prepaid at Clearwire, where he was responsible for launching the first no contract 4G wireless service in the US (Nasdaq: CLWR; acquired by Sprint). Most recently, he served as EVP of Marketing at VoIP innovator magicJack VocalTec Ltd. (Nasdaq: CALL; acquired by B. Riley Financial).

In addition to brand development, Seth developed and served as executive producer of the prime-time series “Lil Bush”, which aired for two seasons on Comedy Central. He earned an MBA & MS in Television Management from Boston University. Seth enjoys tennis, golf, coaching youth baseball and, with his wife Jen, being all-in travel baseball parents to their two sons.

Angel Vassilev

VP Product

Angel Vassilev is a co-inventor of ActivBody’s products and manages hardware development and supply chain. Prior to joining Activbody Angel spent 16 years in a variety of creative roles designing multimedia, video games, and airports. He helped found four companies (including Activbody) and is a trained architect.

Viktor Kalvachev

VP Creative

Viktor Kalvachev has over 20 years of creative and art direction experience across the entertainment industry. He has worked on projects for clients like Steven Spielberg, Disney, PIXAR, Big Fish and Nokia. Viktor received 2 Eisner nominations for his graphic novel Blue Estate. He holds an MFA from the National Academy of Fine Arts in Sofia, Bulgaria.

Jason Liebrecht

VP, Technology

Jason Liebrecht has over 25 years experience working with Software Engineering and Information Systems, including 15 year in senior leadership roles. Jason’s specialties include Project Management & Agile Methodologies, Full Stack Web App Development, and Mobile Development.

He has an extensive background in technology management, from software development to 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. He has demonstrated success with the special challenges of managing technical and development staff in domestic and International marketplaces.

Jason is a serial entrepreneur having previously served as the Director of Engineering at DivX, CTO of Neurohacker Collective, CTO of InternX, and General Manager of If We Ran the World. Jason is also former Army Intelligence working with technology-driven projects, including being on the team that developed the first Predator UAV.

In his spare time, Jason is a Mountain Bike Coach Instructor Trainer and Adventure Traveler, who once rode his motorcycle from San Diego to the Arctic Circle and back.

Ludmil Kalaydjiyski

Senior Director of Engineering & QA

Ludmil Kalaydjiyski has over 24 years of engineering experience working for ALSTOM UK, Motorola, Nokia Siemens Networks, Keysight Technologies, Anite Telecoms, and Activbody. He is responsible for Technical and QA supervision of the full product life cycle for the Activ5 Smart Strength Training Device: from requirements to production, all engineering, quality, process and test activities, including manufacturing stage, and management of US and EU device Certification. Ludmil also managed all test activities for iOS & Android Apps and games. He made design contributions to device security features.

Over six years, Ludmil participated actively in the design and testing throughout the Activ5 device and software product evolution as Technical Project Lead, Software and QA Manager. He played an active role in creation of product prototypes, like Corporate Wellness, submission of device-related patent applications, requirements, interface definitions, and multi-national distributed development. He owned the Agile process and performed product acceptance procedures.

Ludmil has a PhD in Computing and BEng degree in Automatic Control. He has experience in the telecommunications and power electronics industries, including mobile networks, RF & system testing, software development, and real-time systems. He has expertise in Rapid Application & Agile development, and ISO Quality audits.

Ludmil’s hobbies include weight training and swimming.

Michael Price

GM, Activbody U.K.

Michael Price has over 30 years experience in manufacturing , international sales and marketing in the electronics, consumer electronics, wireless technology and IT markets. For the past 16 years he 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.

As senior VP of sales and marketing of a multinational electronics component manufacturing group he developed and implemented the sales and marketing plans that resulted in the group’s global market share reaching 40%. Michael successfully negotiated technology license agreements with manufacturers in the mobile phone and automotive industries. As managing director he started and managed a successful electronics manufacturing/design facility that supplied components to many of leading the mobile phone manufacturers.

Mr. Price 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.

Yoshi Kobayashi

GM, Activbody Japan

Yoshi has 20 years of experience in the dental and medical industries as a marketing director, sales manager, and product management lead of diagnostic imaging devices, including cone-beam CT, digital radiography and imaging software. As Activbody Japan’s lead, he is focused on driving sales and marketing of Activ5 as a senior wellness solution in Japan.

Jochen Kurz

GM, Activbody Germany

Jochen is a scientist and a international sales director. He holds a diploma in physical-chemistry of the University of Heidelberg, Germany. He is a serial entrepreneur and has almost 20 years of experience in marketing and sales in consumer electronics and medical devices. As Activbody Germany’s lead, he manages distribution, support key accounts and resellers and leads the German team.

Jon Tait

Director of Operations

Jon Tait heads operations for Activbody, where he leads logistics and customer care, and serves as office manager. 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 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.

Damien Chavarria

Senior Developer

Damien Chavarria is a highly skilled desktop and mobile application developer with a long tenure in creating consumer facing applications. He excels at building complex multi-platform solutions using the right tool for the job. Damien has extensive knowledge of all legacy and modern aspects of cross platform development from design to deployment. His environment experience spans Linux, Mac OSX, Windows, Android, and iPhone. His specialties include multi-OS programming, testing, optimization, porting, UI/UX Design, and having a good time. When he isn’t coding in front of the computer Damien is an avid cross-fitter.

Kim Carson


Kim Carson is a visual/UI/UX/interactive designer and front-end developer who executes the Activ5 creative vision. She brings more than 15 years of experience working for dozens of companies around the world designing, developing and shipping responsive websites and web applications, mobile apps and other digital media. While she’s not implementing cool effects, blowing out the latest promotional campaign, or figuring out how to make user experiences better, she’s studying politics, screaming her head off for the Seattle Seahawks, or trading cryptocurrencies.

Jan Zikmund

Senior Developer

Jan Zikmund was born on World Health Day. Accordingly, he’s adopted a love of sports and fitness, which keeps him fueled to develop Activbody’s online platform. Jan possesses all common web development skills – from cutting PSD to responsive retina friendly HTML, through Javascript to PHP development, setting-up WordPress and Magento websites and programming tailor-made functionalities. When he’s not coding, Jan can be found snowboarding, surfing, playing guitar, meeting people, learning languages and living life on his terms.

Hope Gaston


Co-Creator of the Activ5 Exercises

With over 15 years of experience in the exercise industry, Hope is a nationally recognized leader, educator, and innovator. As a Muscle Activation Techniques Master level specialist and Medical Exercise Specialist, Hope is known for her ability to create effective exercise solutions for anyone from the physically challenged to the professional athlete. Her knowledge of Biomechanics and how to strategically manipulate force through the body is elevating the fitness game to a whole new level. Hope received her Bachelor of Science degree in Neurobiology and Sports Psychology from the University of Vermont. Hope has mentored under Greg Roskopf, the Biomechanics consultant for the Denver Broncos, and world-renowned physiotherapist Tom Purvis. Hope offers a very well balanced experience for clients with degrees in personal training, yoga, Pilates, and MAT.

Kyle Brown


Co-Creator of the Activ5 Exercises

Kyle Brown’s health and nutrition portfolio includes personal training celebrities and professional and Olympic athletes, founder of FIT 365® shakes, creator of FIT C.E.O and Fierce Sexy Empowered, workshops for Fortune 500 companies, author in top-ranking fitness magazines, and childhood obesity/Type 1 Diabetes advocate.

Kyle is the CEO and creator of FIT 365®, an all-natural, complete low-calorie delicious meal in a shake. Kyle hosted the ESPN Radio show “The Empower Hour” With Kyle Brown. Kyle’s holistic approach to health and fitness supports mind and body must be given everything they require to maintain motivation and vitality. Kyle was a National finalist in 2013 and 2015 for Trainer Of The Year and Voted San Diego’s Best Personal Trainer 2010 and 2011. In his first book entitled “How Much Does A Zebra Weigh?” Kyle empowers you to build self-confidence through a sound mind in a healthy strong body.