The book "The Legibility of Serif and Sans Serif Typefaces" offers a comprehensive and up-to-date analysis of the readability of various typefaces, drawing on over 140 years of research into the readability of print and more than 50 years of research into screen readability. It discusses the origins of serif and sans-serif styles in ancient inscriptions and their development in modern printing techniques. Additionally, it examines the legibility of these typefaces in different contexts and among various reader groups. The book also highlights the latest findings on the readability of serif and sans-serif fonts in internet browsers, on smartphones, and other portable devices. It analyzes the differences in legibility of these typefaces both in print and on screens, and explores reader preferences regarding fonts. The focus is on the psychology of reading, which has clear implications for education and publishing. It is aimed at anyone involved in written communication, whether in printed form or digital.