Dr Jyrki T. J. Penttinen, the author of this Wireless Communications Security book, started working in the mobile communications industry in 1987 evaluating early stage NMT‐900, DECT and GSM radio network performance. After having obtained his MSc (EE) grade from Helsinki University of Technology (HUT) in 1994, he continued with Telecom Finland (Sonera and TeliaSonera Finland) and with Xfera Spain (Yoigo) participating in 2G and 3G projects. He also established and managed the consultancy firm Finesstel Ltd in 2002–03 operating in Europe and the Americas, and afterwards he worked with Nokia and Nokia Siemens Networks in Mexico, Spain and the United States in 2004–2013. During his time working with mobile network operators and equipment manufacturers, Dr Penttinen was involved in a wide range of operational and research activities performing system and architectural design, investigation, standardization, training and technical management with special interest in the radio interface of cellular networks and mobile TV such as GSM, GPRS/EDGE, UMTS/HSPA and DVB‐H. Since 2014, in his current Program Manager’s position with Giesecke & Devrient America, Inc, his focus areas include mobile and IoT security and innovation.

Dr Penttinen obtained his LicSc (Tech) and DSc (Tech) degrees in HUT (currently known as Aalto University, School of Science and Technology) in 1999 and 2011, respectively. In addition to his main work, he is an active lecturer, has written dozens of technical articles and authored telecommunications books, the recent ones being The LTE‐Advanced Deployment Handbook (Wiley, 2016), The Telecommunications Handbook (Wiley, 2015) and The LTE/SAE Deployment Handbook (Wiley, 2011). More information about his publications can be found at www.tlt.fi.