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PPI Authors

PPI Industry Content Experts

PPI, a Kaplan Company, utilizes some of the best-known industry experts to create our Engineering, Architecture, and interior design exam prep products. View the author bios below to learn more about each content expert.

Featured Authors

David Kent Ballast, FAIA, CSI, NCIDQ-Cert. No. 9425

David Kent Ballast, FAIA, CSI, NCIDQ Certification No. 9425, owns Architectural Research Consulting, a firm offering information and management services to architects, interior designers, and the construction industry. Mr. Ballast taught interior construction and other courses at Arapahoe Community College for over 20 years.

Michael R. Lindeburg, PE

Michael R. Lindeburg, PE, is one of the best-known authors of engineering textbooks and references. His books and courses have influenced millions of engineers around the world. Since 1975, he has authored over 40 engineering reference and exam preparation books.

Additional PPI Authors

Alan Williams, PhD, SE, FICE, C Eng

Alan Williams is a registered professional engineer and structural engineer in California, a Fellow and Life Member of the Institution of Civil Engineers, and a Chartered Engineer in the United Kingdom. He obtained his BS and PhD degrees at Leeds University.

Allan Y. Ng, MSCE, PLS

Allan Ng, MSCE, PLS, is a licensed land surveyor in California and a lecturer in the Department of Civil Engineering at California State Polytechnic University, Pomona. He teaches courses on elementary and advanced surveying, GPS, and photogrammetry and LiDAR digital mapping, and he consults on boundary survey and land development projects.

Beth Lin Hartmann, PE

Beth Lin Hartmann PE, is a construction engineering professor at Iowa State University, a small business owner, and a retired Naval officer. She holds a Bachelor of Arts degree in architecture and a Master of Science degree in civil engineering with a specialization in construction engineering and management from Iowa State University.

Bruce A. Wolle, MSE, PE

Bruce A. Wolle, MSE, PE, is currently licensed in 22 states and provides professional engineering services in geotechnical and materials engineering.

Christine A. Subasic, PE

Christine A. Subasic, PE, is a registered engineer in North Carolina and Virginia. She has been a consulting architectural engineer for the past 13 years, specializing in structural and masonry design and standards development. Ms. Subasic earned a BS degree in architectural engineering from Pennsylvania State University.

Daniel C. Deckler, PhD, PE

Daniel C. Deckler, PhD, PE, has worked on a wide variety of projects, including the space shuttle, space station, and anti-submarine warfare systems. He is now a professor of engineering at the University of Akron Wayne College, where he teaches courses in mechanical, electrical, and civil engineering.

Gary E. Demele, FAIA, NCARB

Gary E. Demele, FAIA, NCARB, received his degree in architecture from the College of Environmental Design, University of California, Berkeley. He is a licensed Architect in 4 states and is NCARB certified. Busch Architects, Inc., Minneapolis, Minnesota is a professional practice specializing in educational, religious, health care and recreational buildings where Gary has been vice president since 2008.

George Cole, PhD, PE, PLS

George M. Cole, PhD, PE, PLS, is a practicing surveyor. He is currently vice president of Applied Geodetic Services, Inc. He holds a bachelor of science degree from Tulane University and a master of science degree from Florida State University. Among his numerous publications are the Fundamentals of Surveying Sample Examination (PPI) and Water Boundaries (John Wiley).

Gerald J. Kauffman, PhD, PE

Gerald J. Kauffman, PhD, PE, is an experienced water resources and watershed management engineer. He is the director of the University of Delaware’s Water Resources Center and was appointed as Delaware’s first water coordinator in 1999. He holds faculty appointments in the University of Delaware’s Department of Civil and Environmental Engineering and School of Public Policy and Administration.

Holly Williams Leppo, AIA, NCIDQ-certified, LEED AP

Holly Williams Leppo is an NCARB-certified architect registered, a certified interior designer, and a LEED Accredited Professional. She holds a bachelor of arts degree in integrative arts from The Pennsylvania State University and a master of architecture degree from Washington University in St. Louis.

James Giancaspro, PhD, PE

Dr. James Giancaspro is an Associate Professor of Civil Engineering at the University of Miami in South Florida, and has been on the faculty since 2006. He received Bachelor of Science, Master of Science, and Doctoral degrees in Civil Engineering from Rutgers, the State University of New Jersey.

Jan Van Sickle, PLS

Jan Van Sickle, PLS, is a licensed surveyor in California, Colorado, and Oregon. He has supervised geodetic and GPS control surveys on several continents and has taught surveying courses at the Denver Institute of Technology.

Jeffrey A. Hanson, PE

Jeffrey A. Hanson, PE, has prepared students for the Mechanical PE exam since 2002. He has coordinated and taught PE review courses for the Dallas-Fort Worth ASME and for Fortune 500 companies. He received his bachelor of science degree in mechanical engineering from Arizona State University and his master of science degree in engineering management from Southern Methodist University.

John A. Camara, PE

John A Camara, PE in Nuclear and Electrical Engineering, is author of a dozen plus reference and practice problems books, as well as online material, used as study guides for the Electrical and Computer: Computer Engineering/Electronics, Controls, and Communications/Power exams.

Jonathan A. Brant, PhD, PE

Jonathan A. Brant, PhD, PE is an assistant professor in the department of civil and architectural engineering at the University of Wyoming. His research focuses on the development and implementation of advanced technologies and techniques for treating drinking water, wastewater, and water for industrial purposes.

Joseph S. Schuster, P.E., S.E.

Joseph S. Schuster, P.E., S.E., is a practicing structural engineer licensed in New York, New Jersey, Connecticut, and Illinois. He holds a BS in civil engineering from Cornell University and an MS in structural engineering from Stanford University. Currently, Mr. Schuster works in the Newark office of Thornton Tomasetti, a leading engineering firm.

Keith E. Elder, PE

Keith Elder, PE, has been a licensed professional engineer in Washington since 1986. He teaches courses in HVAC design, fluid dynamics, hydraulic machines, and PE exam review at the University of Washington, where he is a faculty member and received his bachelor's degree in mechanical engineering in 1981.

Kirsten Sinclair Rosselot, PE

Kirsten Sinclair Rosselot, PE, is the owner of Process Profiles, a consulting firm that specializes in environmental planning and management tools. Ms. Rosselot obtained her bachelor of science degree in chemical engineering from the University of California, Los Angeles, and is a licensed professional engineer in the state of California.

Majid Baradar, PE

Majid Baradar, PE, a civil/earthquake engineering consultant, worked for 18 years at the California Department of Transportation (Caltrans). He is a registered civil engineer and a licensed building general contractor. Mr. Baradar is also the author of 345 Solved Seismic Design Problems and co-author of Seismic Design of Building Structures (both from Professional Publications, Inc.)

Nikhil Kar, PhD PE

Nikhil Kar holds PE licenses in Mechanical Engineering and Metallurgical and Materials Engineering, as well as a PhD in Mechanical Engineering. He has independently developed review course material for the Metallurgical and Materials Engineering PE exam, including many problems, and has taught extensively.

Ashok V. Naimpally, PhD, PE

Ashok V. Naimpally, PhD, PE, is a professor in the College of Engineering and Computer Science at California State University, Long Beach. A licensed professional engineer in the state of California, Dr. Naimpally's teaching areas include chemical engineering and environmental technology.

C. Dale Buckner, PhD, PE, SECB

C. Dale Buckner is a registered professional civil engineer in Virginia. Dr. Buckner has consulted on engineering projects, and he now teaches in the Department of Civil and Environmental Engineering at the Virginia Military Institute. He holds bachelor of science, master of science, and doctorate degrees in civil engineering from North Carolina State University.

Elaine Huang, PE

Elaine Huang, PE, is a registered civil engineer in multiple states. Ms. Huang holds a bachelor of science degree in civil and environmental engineering from the University of Massachusetts Amherst and a master of engineering degree from the Massachusetts Institute of Technology.

Frederick S. Roland, PE, SECB, RA, CFEI, CFII

Frederick S. Roland, PE, SECB, RA, CFEI, CFII, holds professional licenses in both engineering and architecture in a number of states. He has taught courses, including PE exam review, at the University of Delaware and for the School of PE. Mr. Roland earned his bachelor of architecture degree and master of science degree in structural engineering from the University of Illinois.

Harriet G. Cooke, PE

Harriet G. Cooke, PE, received her professional engineering license in North Carolina in 1998. She holds three patents and several trade secrets, and has written a series of technical papers. Ms. Cooke received her bachelor's degree in mechanical engineering from the Georgia Institute of Technology in 1991.

International Code Council

The International Code Council (ICC) is a membership association dedicated to building safety and fire prevention. ICC develops the codes and standards used to construct residential and commercial buildings, including homes and schools.

Lessa Grunenfelder, PhD

Lessa Grunenfelder, PhD, received her doctorate in Materials Science in 2012 from the University of Southern California. Dr. Grunenfelder is currently a full time faculty at USC, teaching materials science at both the undergraduate and graduate level. She has also taught review courses for the Metallurgy and Materials PE Exam.

Marta Vasquez, PhD, PE

Marta Vasquez, PhD, PE, is an environmental chemist with the Louisiana Department of Environmental Quality. She holds a BS degree in chemical engineering from Antioquia University in Medellin, Colombia, an MS degree in organic chemistry from Del Valle University in Cali, Colombia, and a doctorate in analytical chemistry from Louisiana State University.


The National Council of Examiners for Engineering and Surveying (NCEES) is a national nonprofit organization dedicated to advancing professional licensure for engineers and surveyors. It develops, administers, and scores the examinations used for engineering and surveying licensure in the United States.

Norman R. Voigt, PE, PLS

Norman R. Voigt, PE, PLS, is registered as both a civil engineer and land surveyor in Pennsylvania. He has been responsible for design, construction, maintenance, and inspection on a variety of highway and transit projects. Since 1974, he has taught or acted as curriculum coordinator for The Pennsylvania State University's Civil PE review course.

Peter R. Boniface, PhD, PLS

Peter Boniface, PhD, PLS, is a licensed surveyor in California and an associate professor in the Department of Civil Engineering at California State Polytechnic University, Pomona. He teaches a review course for the California Special Civil Engineer Examination and consults on softcopy photogrammetry and GPS surveying projects.

R. Wane Schneiter, PhD, PE

R. Wane Schneiter, PhD, PE, is the Deputy Superintendent for Academics and Dean of the Faculty at the Virginia Military Institute (VMI). He joined the VMI faculty in 1990. Prior to his appointment as dean, he served as the head of the Civil and Environmental Engineering Department and held the Benjamin H. Powell Jr. '36 Professorship in Engineering. 

Rima Taher, PhD, PE

Rima Taher, Ph.D, P.E., is a Senior University Lecturer at the Hillier College of Architecture & Design, at NJIT, and is a part-time instructor in the graduate program at the NJIT-Department of Civil & Environmental Engineering. She is a licensed professional engineer in New Jersey and practices as a civil/structural engineer with her own consulting firm “Taher Engineering LLC”.

Robert R. Zinn

Robert R. Zinn holds a BS degree in chemistry from Midwestern University in Wichita Falls, Texas. He has worked in the field of electronic component manufacturing, electronic service, computer repair, instrument repair, and computer programming for 35 years.

Thomas Korman, PhD, PE, PLS

Thomas Korman, PhD, PE, PLS, is a registered professional engineer and land surveyor in the state of California and a member of the American Society of Civil Engineers. His extensive practical experience includes the design and construction of civil infrastructure projects with an emphasis on capital improvement projects for roadways, parks, and recreation facilities and water and sewer infrastructure.

Transportation Research Board

Transportation Research Board (TRB) is one of six major divisions of the National Research Council.

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