James O. Aldrich (Doctor of Public Administration, University of Laverne) is a retired lecturer on statistics and research methods at California State University, Northridge. He has also taught graduate level research courses for the University of La Verne. Dr. Aldrich held the appointment of Instructor in the Department of Pathology at the University of Southern California, School of Medicine where he served as the Principal Investigator and codirector of a National Cancer Institute research project. He has served on various committees for the Los Angeles chapter of the American Statistical Association and has also taught biostatistics, epidemiology, social statistics, and research methods courses for 20 years. The primary computer program used for his coursework has been the IBM SPSS Statistics software package. SAGE recently published, in 2013, Building SPSS Graphs to Understand Data, coauthored with Hilda M. Rodriguez.

Hilda M. Rodríguez (Bachelor's Degree in Sociology, California State University at Northridge) was the teaching assistant in statistics and the laboratory using the Statistical Package for the Social Sciences. She edited the original manuscript and discovered many useful additions that were incorporated in Using SPSS: An Interactive and Hands-on Approach, a book published by Sage Publications in July 2011. She came to this country from El Salvador speaking Spanish only but soon learned English and has begun her pursuit of higher education. Hilda is active at her church, St. Joseph the Worker, in Winnetka, California where she teaches religious doctrine to children, young adults and seniors. It is in this work that her bi-lingual and bi-cultural capabilities benefit her students.