DR. JOHN P. SPIVEY has over 20 years experience in the petroleum industry, with interests in pressure transient analysis, production data analysis, reservoir engineering, continuing education, and software development. From 1984 to 1990, he worked for SoftSearch, Inc. (later Dwights EnergyData) developing petroleum economics and engineering software. In 1990, he joined S.A. Holditch & Associates (SAH), which was purchased by Schlumberger (SLB) in 1997. While at SAH/SLB he conducted reservoir simulation, gas storage, and tight gas application studies and taught industry short courses in well testing and production data analysis. He actively participated in on-going development of SABRE, SAH numerical reservoir simulator, and in research in techniques for production data analysis for gas wells. He also designed and developed PROMAT, an analytical production data analysis and forecasting program, and WELLTEST, an interactive pressure transient test analysis program. In 2004, he started his own reservoir engineering consulting company, Phoenix Reservoir Engineering, and software development company, Phoenix Reservoir Software, LLC, which provides PMTx, a software package for analyzing production and production log data and forecasting future performance for multilayer low permeability reservoirs. Since 1992, he has served as Visiting Assistant Professor or Adjunct Assistant Professor at Texas A&M University, teaching undergraduate and graduate classes in gas reservoir engineering and pressure transient analysis, and serving on several graduate student committees. He is the editor of the SPE Reprint Series Vol. 52, Gas Reservoir Engineering, and Vol. 57, Pressure Transient Testing, and coauthor of SPE Textbook Series Vol. 9, Pressure Transient Testing and has published numerous papers and articles in industry journals and trade publications. He received a BS Physics from Abilene Christian University, a MS in Physics from the University of Washington, a PhD in Petroleum Engineering from Texas A&M University, and is a registered professional engineer in the state of Texas.