Juan A. Gallego-Juárez is a Spanish  scientist, physicist and Research Professor (retired) at the Higher Council for Scientific Research (CSIC), Madrid, Spain, where he founded the Ultrasound Laboratory in 1971 and was Director of the Acoustics Institute for more than 12 years and Director of the Center for Physics Technologies that integrated several research institutes. 

He  held previous positions in 1967-70 at the Ultraacoustics Institute of the Italian National Research Council in Rome where he was Research Fellow and Scientific Collaborator. 

He has contributed to ultrasonics over 300 papers and 43 patents, been invited lecturer in more than 45 international and national conferences.

He holds an honorary doctorate and the Gold Medal from the University of Santiago de Chile and was awarded the Rayleigh Medal 2017 by the Institute of Acoustics (United Kingdom).

 He was President of the 19th International Congress on Acoustics (Madrid 2007) and Local Organizer of the Ultrasonics International Conference (Madrid 1989) 

He founded the startup company on power ultrasonics PUSONICS SL and was its chief scientific advisor and chairman

His research work has always been related to ultrasound and more specifically to power ultrasound in gases and multiphase media where he has been a pioneer in exploring new fields of application. His major contribution to Power Ultrasound has been the design, development, and implementation at the laboratory and industrial level of a new family of power sonic and ultrasonic generators with extensive stepped-plate radiators for use in gases, liquids, and multiphase media. Furthermore, he has studied and developed in such specific media a series of new technologies for application of the ultrasonic energy to environmental treatments (fine particle removal, sludge filtration), food processing (defoaming, drying, extraction) and manufacture (textile washing, debubbling of coating layers, pigment dispersion). In addition, he has carried out extensive theoretical and experimental studies about the nonlinear acoustic propagation of high-intensity waves in such low-density/inhomogeneous media as well as in the metallic and piezoelectric materials constituting the power transducers under high vibratory stresses.