Andrew Michalski, PhD, CGWP, PG is a semi-retired hydrogeologist with more than 45 years of academic and consulting experience. In addition to publishing seminal papers on groundwater occurrence and movement in fractured bedrock of the Newark basin, Dr. Michalski developed practical bedrock hydrogeologic characterization tools based on his hands-on investigations of numerous contaminated bedrock sites. He received a M.S. in Mine Hydrogeology (in 1969) and a Ph.D. in Technical Sciences from Cracow, Poland (in 1974). He was a principal at Michalski & Associates, Inc. for 25 years. Earlier, he held senior technical positions with The Whitman Companies, TRC, and the Earth Technology Corp. He also taught an undergraduate hydrogeology course at Rutgers University.