John F. Shaeffer

Principal Scientist / President Marietta Scientific, Inc.


bulletPh.D., Physics, St. Louis University 1971
bulletM.S., Physics, Arizona State University 1965
bulletB.S., Physics, University of Florida 1963

Employment History

Marietta Scientific, Inc. 1994- Present Principal Scientist, President, co-owner
Denmar, Inc., Atlanta Office 1988­1994 Principal Scientist
Lockheed­Georgia Company 1985­1988 Program Manager for Low Observables
Georgia Institute of Technology 1980­1985 Senior Research Scientist
McDonnell Douglas Corporation 1966-1980 McDonnell Douglas Research Laboratory


1976­1980 Scientist


1966­1968 Research Associate
McDonnell Aircraft Company 1973­1976 Technical Specialist


1971­1973 Senior Engineer
St. Louis University 1968­1971 Graduate Study (Laboratory)
Boeing Company 1965­1966 Research Engineer
Arizona State University 1963­1965 Graduate Assistant
University of Florida 1959­1963 Radio Engineer First Class, Lab Technician

Experience Summary

Formed MARIETTA SCIENTIFIC, Inc. to provide Radar Cross Section engineering services and software development. At DENMAR, Inc., Radar Cross Section Engineering Support Services, established the Atlanta Office. Provides training, analytical, project, measurement, and materials analysis support to industry and government. Has developed a three day Design Oriented Radar Cross Section short course and specialized Method of Moments codes for 3-D patches, bodies of revolution, wires, and 2-D R card geometries. Recent co-author of a chapter in Radar Reflectivity Measurements. At the Georgia Tech Research Institute lectures for the Radar Cross Section Reduction Short Course and has aided in course reorganization. At Lockheed­Georgia Possum Works, was Engineering Program Manager for Low Observables. Organized, hired, and trained a staff of RCS engineers. Responsible for Internal and Contract Research and Development (IRAD and CRAD) Programs in LO; for intercompany work; for LO Technology Development for program applications; and for staffing programs with LO engineers. The LO Group was organized with groups for: Analysis, Test, Materials, and Projects. Is the second of three authors of Radar Cross Section, published by Artech, 1985 and the second edition in 1993. At Georgia Tech, was project director in the area of general electromagnetic modeling and RCS measurements/data reduction. Has been one of the three principal authors and lecturers of a radar cross section training course. Has developed unique numerical methods to model the magnetic fields of Naval vessels. Lectured on "Factors External to the Radar," in the Principles of Modern Radar short course; and also "Electric, Magnetic, and Dielectric Static Field Models," in the Electromagnetic Signatures short course. At the McDonnell Douglas Research Laboratory, worked on techniques and methods for analytically modeling electromagnetic behavior of complex shapes and structures. Has formulated a strong coupling analysis for computer codes based on the method of moments, and developed electrostatic codes for analysis of multiple conductors described by potential or net charge immersed in an external electric field. From 1974 to 1977, was associated with the Gas Dynamics Laboratory and developed computer codes for the analysis of swirling, turbulent radiative arc heater flow fields. These codes involved numerical techniques for solving coupled systems of nonlinear, parabolic, partial differential equations. From 1971 to 1974, was associated with the Electronic Systems Technology Group of McDonnell Aircraft, investigating the interaction of lightning and other electrostatic phenomena with aircraft and for investigating electromagnetic shielding properties of advanced graphite and boron epoxy composite materials and structures. Work at McDonnell from 1966 to 1968 involved the design and diagnostic of radio frequency generated plasmas. Graduate work at St. Louis University was in plasma physics. Dissertation topic was "Electrostatic Probes in Collisionless Plasmas," an experimental investigation of spherical and cylindrical electrostatic probe responses.

Current Fields of Interest

Numerical electromagnetic modeling; resonant region radar cross section analysis; antenna analysis.

Special Honors

Title IV Fellow, National Defense and Education Act, St. Louis University; Sigma Xi, Honorary Research Society.

Security Clearance

Top Secret/SBI

Major Reports and Publications

bullet"Bistatic k Space Imaging for Electromagnetic Prediction Codes for Scattering and Antennas", NASA Technical Memorandum xxxx, 1995, draft
bullet"Body of Revolution Phi Flip Matrix and BOR-PATCH System Matrix Optimization," IEEE Transactions on Antennas and Propagation, revised and re-submitted July 1995.
bullet"Combined Body of Revolution and Patch Moment Code," NASA Contractor report 194988, October 1994.
bulletRadar Cross Section, Second Edition, Published by: Artech House, Inc., Norwood, MA 02026, 1993, Co-author with E.F. Knott and M.T. Tuley
bullet"MOM3D Method of Moment Code Theory Manual," NASA Contractor Report 189594, March 1992.
bullet"Computational Diagnostic Techniques for Electromagnetic Scattering: Analytical Imaging, Near Fields, and Surface Currents," with Kam W. Hom and Noel A. Talcott, Jr., HAVE FORUM '92 SYMPOSIUM, 23-25 June 1992, Wright-Patterson AFB, Ohio.
bullet"Design Oriented Radar Cross Section Short Course," a three day course with topics in: 1) Overview and Fundamentals; 2) Radar Cross Section Reduction Approaches; 3) Analytical Tools and Measurements; and 4) Materials. Course designed for on-site presentation.
bulletRadar Reflectivity Measurement: Techniques and Applications, Co-author of Chapter 8, Data Analysis Techniques, Published by Artech House, Norwood, MA 02062, 1989.
bullet"MOM3D, A Method of Moments Code for Electromagnetic Scattering," Denmar, Inc. Report, June 1989.
bullet"Southwall Blended Taper Algorithm RCS Performance Prediction," Denmar, Inc. Report, December 1988.
bullet"Hughes Edge Card 2-D Method of Moments Study," Denmar, Inc. Report, December 1988.
bulletRadar Cross Section, Published by: Artech House, Inc., Norwood, MA 02026, 1985, Co-author.
bullet"X­Band Data Transmission Antenna Feed Design", Parts I and II, Analysis Report for Sperry Corporation Defense Systems Division, Georgia Tech Project A­3752, March 1984 and May 1984, Task Leader and Co-author.
bullet"Radar Cross Section (RCS) Study Of Aircraft Stores­Have Scatter II", Volumes 1­4, November 1983 Tests, Contract F33657­82­G­2084­R003, Georgia Tech Project A­3548, Project Director and Principal Author.
bullet"Radar Cross Section Interaction Test Plan", June 1984, Georgia Tech Project A­3548, Principal Author.
bulletRCS Prediction/Reduction Briefing for Brunswick Corporation, Georgia Tech Project A­3768, July 1984, Project Director.
bulletRCS Data Reduction Software User's Guide", 1985, Georgia Tech Project A­3978, Project Director and First Author.
bullet"Radar Cross Section Analysis of Advanced Missile Configurations (U)," Purchase Order V­362­RA­308040, Task 83­5, Rockwell Missile Systems Division, November 1983, Co-author.
bullet"Radar Cross Section (RCS) Study of Aircraft Stores." Test Report, Contract F33657­82­33657­82­G­2083, D.O. RH03, Volumes 1­4, August 1983, Principal Author.
bullet"Radar Cross Section Training Course," Georgia Tech Department of Continuing Education Short Course, (five chapters), April 1983, one of three Principal Authors and Lecturers.
bullet"HYPAM Magnetic Sweep Optimization," Contract No. N00612­79­D­8004 HR 50, December 1982, Co-author.
bullet"Target Ship Self Protection Against Intelligent Magnetic Mines," Contract No. N00612­79­D­8004 HR­47, November 1982, Principal Author.
bullet"Reduction of Ship Detectability," American Society of Naval Engineers Symposium, Pascagoula, Mississippi, 30 September 1982, Co-author.
bullet"EM Scattering from Bodies of Revolution with Attached Wires," IEEE Transactions on Antennas and Propagation AP­30, No. 3, May 1982.
bullet"Surface Ship Magnetic Silencing ­ Target Ship Self Protection Coordination Meeting Report," Naval Surface Weapons Center, White Oak, Maryland, 28 May 1982.
bullet"Analysis of Target Ship Self Protection Concepts," Contract No. N00612­79­D­8004 HR­33, May 1982, Co-author.
bullet"Proposed Radar Cross Section Traveling Wave Analysis," Army, Research Office and Georgia Institute of Technology's School of Electrical Engineering, February 1982.
bullet"Ship Magnetic Signature Program ­ Accomplishments and New Directions," Office of Naval Research, Arlington, Virginia, January 1982.
bullet"Sensor System Calibration Preliminary Study," Contract No. N00612­79­D­8004 HR­42, October 1981, Principal Author.
bullet"Ship Signature Models ­ A Review,"Naval Coastal Systems Center, August 1981.
bullet"Radiation from Wire Antennas Attached to Bodies of Revolution: The Junction Problem," IEEE Transactions on Antennas and Propagation, May 1981.
bulletMagnetic Signature Numerical Modeling (U), "Final Report on Contract No. N00612­79­D­8004 HR­27, November 1980, Principal Author.
bulletComputer Model of Magnetic Influence Fields of Target Vessels," Task 4 report on Contract N00612­79­C­8004 HR­15, October 1980, Principal Author.
bullet"Corona and Antenna Effects in the RH­53D Mine Sweeping Helicopter and Raydist Navigation Set," paper presented at the 1980 IEEE International Symposium of Electromagnetic Compatibility, Baltimore, Maryland, 7­9 October 1980.
bullet"EM Scattering from Bodies of Revolution with Attached Wires," Presented at the IEEE AP­S International Symposium, Quebec, Canada, 2­6 June 1980.
bullet"Junction Treatment for BOR Geometries," 1979 International Symposium Digest IEEE Antennas and Propagation, pp. 163­166, Seattle, Washington, June 1979.
bulletCompatibility of the RH­53D Minesweeping Helicopter and Raydist Navigation Set." NCSC Navy Contract Report, MDC Q0688, August 1979.
bullet"High Performance ARC Heater Design," ISA Transactions 18, No. 1, 43­57, 1979, Co-author.
bullet"Swirl Arc: A Model for Swirling, Turbulent, Radiative Arc Heater Flow Fields," AIAA Journal 16, 1978.
bullet"High Potential Clouds in Jet­Engine Exhausts," AIAA Journal 14, 1161, 1976, Principal Author.
bullet"ARC Heater Performance on Hydrogen, Helium, or Air," AIAA Journal 14, 1161, 1976, Co-author.
bullet"Performance and Scaling Characteristics of a Huels­Type ARC Heater Operating on Hydrogen, Helium, or Air," AIAA Paper 76­14, January 1976, Co-author.
bullet"Air Thermophysical Properties for Temperatures to 3000oK and Pressures to 300 ATM," MDC Q0581, December 1975.
bullet"Evaluation of Experiments Using Electrostatic Probes to Detect Imminent Failure of Jet Engine Gas­Path Components," AFFDL­TR­75­74, July 1975, Co-author.
bullet"Aircraft Related Lightning Mechanisms," AFAL TR­72­386, January 1973.