Marco Altini, born in 1984 in Ravenna, Italy, received his Master’s degree in Computer Science Engineering from the University of Bologna, Doctor of Philosophy in Electrical Engineering from Eindhoven University of Technology and Master’s degree in Human Movement Sciences and High Performance Coaching from Vrije Universiteit Amsterdam. He is the founder of HRV4Training and has developed and validated several tools to acquire and analyze physiological data using mobile phones. He is an advisor at Oura and guest lecturer in Data in Sport and Health at Vrije Universiteit Amsterdam. Marco has published more than 50 peer-reviewed papers at the intersection between physiology, technology, health and performance.

Hannu Kinnunen, born in 1972 in Pattijoki, Finland, received his Master degree in Biophysics and Doctor of Science (Technology) degree in Electrical Engineering from University of Oulu, Oulu, Finland in 1997 and 2020, respectively. He has worked in the industry with pioneering wearable companies Polar Electro (1996–2014) and Oura Health (2014–2021) in various specialist and leadership roles. In addition to algorithms embedded in consumer products and research tools, his work has resulted in numerous scientific publications and patents. His past research interests included feasible methodology for metabolic estimations utilizing accelerometers and heart rate sensors, and lately his work has concentrated on wearable multi-sensor approach for the quantification of human health behavior, sleep, and recovery.