The general public is usually supplied by books on mathematical scientists written by "science communicators" and other outside observers--the worst by far being the academic historians of science. Their books are like reviews of comparative squid ink recipes written by anorexics, or descriptions of the Loire Valley by visually impaired travel writers. They are well written, which masks the BS. The descriptions focus on "interesting" traits of the personalities; scientists are discussed as if they were partaking of spectator sports. This fellow "was the best...", this fellow "was the first to...", "Einstein made a big blunder", etc. This book, "Idea Makers", is written from an insider. It is the real thing on several accounts. Primo, Wolfram deserves to be in the book as an "idea maker", in his own right. Secondo, Wolfram is the developer of a new way to do (useful) mathematics, an entirely new method, which allows us to tinker with mathematics, something that is an anathema to purists. Thus he depicts Ramanujan, not with the usual mathematical prism of the theorem crowds, but as someone who, starting with intuitions, does experiments till a mathematical identity feels right. As an eyewitness, I spent almost all my career in quant finance and probability toying with Mathematica (Stephen Wolfram's invention), and saw it accumulate special functions and tools. Mathematica allowed me to be a car mechanic who looked under the hood; such experience makes us look at the pompous theoretician as a cook would a nerdy chemist. The book is about this refreshing perspective: theorems were to Ramanujan a thing used by European mathematicians to convince other European mathematicians. Terso, Wolfram is fair. He shows a fair --even adulatory-- portrait of Mandelbrot, in spite of attacks by the latter. Indeed, if Mandelbrot hated someone, the person has to be good and threatening. Otherwise he would not bother mentioning him. Finally, many of the people involved are actually known either personally (Feynman, Mandelbrot, Minsky), or like Boole, Ramanujan, Godel, and Lebnitz, "connect" to the author.