WALTER M. HOSACK is retired from a career as registered architect, certified city planner, Director of Planning, Engineering, Building, and Code Compliance in local government, and a Deputy Director in the Ohio Department of Transportation. His past experience has included leadership, management, design and production experience in architecture, engineering, urban design, city planning, building regulation, code compliance and zoning administration. He has designed, produced and managed strategic plans and contract documents for projects ranging in size from residential homes to $100 million commercial projects. He has previously written Land Development Calculations, editions 1 and 2, published by McGraw-Hill. These efforts combine with his education and experience to form the technical foundation for The Science of City Design.