Of Gibbs he wrote:`[His] book is … a masterpiece, even though it is hard to read and the main points are found between the lines’. A year before his death, Einstein paid Gibbs the highest compliment. When asked who were the greatest men, the most powerful thinkers he had known, he replied ‘Lorentz,’ and added, ‘I never met Willard Gibbs; perhaps, had I done so, I might have placed him beside Lorentz’
From Abraham Pais’ Subtle is the Lord…: The science and life of Albert Einstein. I first read the book sometime in 1991-1992. I am reading it again and my comprehension of the details is much better this time around. Enjoyable and strongly recommended by the way (and, an Oxford lives paperback is available for about 400 rupees)!