This book is a scientific biography of Oliver Heaviside, the maverick genius of physics and engineering whose contributions were long underestimated. Born into Dickensian poverty in London in 1850, Heaviside received little formal education and never held an academic position. Largely selftaught and working in intellectual isolation, he nevertheless produced ideas of extraordinary originality and depth that reshaped multiple scientific disciplines. Heaviside made seminal contributions to electrical engineering, including fundamental advances in telegraphy and telephony and the prediction of the ionospheric layer that now bears his name. In physics, his work transformed electromagnetic theory, clarified the behavior of fields generated by moving charges, and anticipated concepts later associated with gravitational waves and Cherenkov radiation. In applied mathematics, he pioneered vector calculus and developed operational methods that proved essential for solving complex differential equations. Much of this work was neglected or misunderstood during his lifetime and for decades thereafter, only to be rediscovered and fully appreciated in the second half of the twentieth century. Aimed at graduate students and researchers in engineering and the physical sciences, this is not a popular or anecdotal biography.

Instead, it offers a detailed, technically informed account of Heaviside's life and scientific ideas, situating his achievements within their historical context while carefully explaining their conceptual significance. The book provides a thorough reassessment of a singular figure whose legacy continues to influence modern science and technology.