Greg C. Stone has a PhD in electrical engineering with over 45-years' experience in performing PD testing on rotating machines and other equipment for a large electric power utility; as well as with PD equipment manufacturer Iris Power L.P., which he co-founded. He has many technical awards for his work from the IEEE, CIGRE, IEC and EPRI, and is an IEEE Fellow.

Andrea Cavallini, PhD, is with the University of Bologna, Italy where he has researched PD theory and PD test methods for 24 years, particularly for power cables, stator windings and other HV equipment. He was also a co-founder of TechImp S.r.L, a manufacturer of PD test equipment. He has over 200 papers in the PD field, including the development of the TF map method for noise and PD source identification. He is an IEEE Fellow.

Glenn Behrmann worked for over 20 years on PD measurements for GIS and rotating machines at ABB in Switzerland and its successor companies. He has been active in creating CIGRE Technical Brochures in this area, written many papers in the field, as well as helping to lead the efforts to draft IEC 62478, and revise IEC 60270 and IEEE 454. He has a BSEE from Union College in the USA.

Claudio Angelo Serafino is head of the Test and Measurement Department for Terna S.p.A, the Italian transmission grid utility. He is an expert with 40-years' experience on power transformer condition assessment using PD and other technologies.