Jorge Sánchez Almeida is a senior researcher at the Instituto de Astrofísica de Canarias, Spain. He has worked in several astrophysical fields including the cosmic microwave background, astronomical spectropolarimetry, solar magnetometry, galaxy formation and evolution, and big data science. He is author of more than a hundred refereed papers and has edited two books on solar magnetic fields. He has a wealth of experience teaching astronomical optics and solar magnetometry at graduate level. María Jesús Martínez González is the principal investigator of a research project on stellar magnetism and spectropolarimetry at the Instituto de Astrofísica de Canarias, Spain. She has authored 50 research papers, and was awarded the JOSO prize in 2011 for the best paper by a young solar physicist. She is also a member of the Board of Directors of the Spanish Astronomical Society.

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• List of contributors; List of participants; Preface; Acknowledgments; 1. Astrophysical magnetic fields: essentials J. Sánchez Almeida and M. J. Martínez González; 2. Solar magnetic fields. History, tragedy or comedy? P. G. Judge; 3. Stellar magnetic fields O. Kochukhov; 4. The role of magnetic fields in AGN activity and feedback R. Keppens, O. Porth and H. J. P. Goedbloed; 5. Magnetic fields in galaxies R. Beck; 6. Primordial magnetic fields in the Early Universe and CMB anisotropies F. Finelli and D. Paoletti.