Men of Physics: Karl Lark-Horovitz presents the biography of Karl Lark-Horovitz, a physicist who significantly contributed in the then-young field of experimental nuclear physics. This book discusses the Lark-Horovitz important work in structure determination by X-ray and electron diffraction methods. Organized into two parts encompassing 19 chapters, this book begins with an overview of the biographical account of Karl Lark-Horovitz. This text then describes Lark-Horovitz's creation of a highly regarded graduate program in physics at Purdue University, which is a feat involving both the acquisition of facilities in the face of enormous difficulties and the stimulation of young physicists to develop their talents. Other chapters consider Lark-Horovitz's personal efforts and achievements in the renascence and unfolding of the field now known as solid state physics. The final chapter describes the influence of physical phenomena on visual acuity and the apparent image size. This book is a valuable resource for physicists, teachers, and students.