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Understanding is more important than facts. This book is a comprehensive introduction to Einstein's work, suitable for beginners and students up to university level, which emphasises meaning over content.
The author has a lifelong interest in relativity and cosmology, with a degree in physics and a Ph.D. in gravitational dynamics. He later diversified from astrophysics to problems of manned space flight, completed a medical degree, and took up a research appointment. He was advisor to the NASA Apollo moon project, has travelled and lectured widely, and written many papers and articles. Subsequently he returned to a clinical practice, but is now retired and devotes time to writing and his hobby of astronomy.