Aarne Mämmelä received the D.Sc. (Tech.) degree (Hons.) from the University of Oulu, in 1996. He was with the University of Oulu from 1982 to 1993. In 1993, he joined VTT Technical Research Centre of Finland Ltd., Oulu. From 1996, he has been a Research Professor of Wireless Communications. After his retirement at the beginning of 2022, he has had a part-time contract with VTT. From 2022, he has been a Professor Emeritus with the University of Oulu. He visited the University of Kaiserslautern, Germany, from 1990 to 1991 and the University of Canterbury, New Zealand, from 1996 to 1997. He has given lectures on research methodology including the systems approach at the University of Oulu for over 20 years. He has been an advisor to ten doctoral students and published over 45 journal articles, 15 book chapters, and over 100 conference papers. From 2016 to 2018, he was a Research Council of Natural Sciences and Engineering member at the Academy of Finland. From 2014 to 2018, he was an Editor of the IEEE Wireless Communications.