[4] After graduation Clark started his career as assistant manager at the Machine Tool Co. of Cincinnati, and spend one year in the Orient.

[13][14] Clark wrote several books over the course of his career, including The Gantt Chart: A Working Tool of Management (1922), Shop Office and Forms: Their Design and Use (1925), and The Foreman and His Job (1926).

[14] In the 1920s Woodward & Tiernan sought to build the most advanced printing plant possible and selected the finest talent to plan and design it.

Such attention to the relationship between building form and the material production inside is a fundamental component of daylight factory design.

[14] In 1933 he led a commission charged with studying and reorganizing government monopolies in Turkey, and later served as the American representative on industrial engineering to the International Labor Office in Switzerland.