Visual Editor Banner
About Us Training Software Support
Main Page Visual Editor Training The Visual Editor Get the Visual Editor
Company Info Penelope/PenGUIn Workshops Nucwiz Help, Support, Known Bugs
Email Randy Schwarz MCNP6 Intermed. Workshops Penelope/PenGUIn Free Downloads
Vised Gallery Onsite Training Other Software C++ Tips and Tricks
Vised Video Demos. Consulting Gamma Spectroscopy Tools  

lee carter memorial


Leland L. Carter

In memorial...

Dr. Leland Lavelle Carter died peacefully in his sleep on January 30, 2020.  He leaves behind his wife, Gerry, after over 60 years of marriage.  He was the father of four children: Carol (Dale) Layne, Mike (Tamara) Carter, Linda (Allen) Swenson, and Wayne (Editha) Carter. 


He was born on November 27th, 1937 in Oberlin, Kansas and grew up on the family farm in Colorado with his parents and four younger siblings.  While completing his Physics degree at Northwest Nazarene College, he met and married Gerry on June 7, 1958.  While completing his Master's degree and Ph.D at the University of Washington, they added four children to their family.


Lee's first professional position as a Nuclear Physicist was at Los Alamos National Laboratory (LANL). He was instrumental in the first release of MCNP to RSICC.  MCNP became his life's work and it has been used by millions over that last 40 years in almost every country on the earth.  He further improved MCNP in the 80s by creating a graphical user interface, the Visual Editor.  As part of that work, he mentored a new college graduate, Randy, in the science of nuclear engineering and, especially, in the use of MCNP and creation of the Visual Editor.  After his retirement from Westinghouse and the forming of Visual Editor Consultants (now Schwarz Software & Consulting) he consulted and taught classes for many years before fully retiring to Keizer, OR to be with family.  We are proud to carry on this work that he started.


Please take a moment and read through his many accomplishments listed below that show a life well lived.  He was a good man, an amazingly brilliant scientist, a devoted family man, a kind and caring mentor, and he created tools that have changed how the nuclear industry does the calculations that build reactors, implement radiation therapies that cure diseases, and keep workers safe from radiation doses by calculating proper shielding.


He will be greatly missed.


Ph.D Nuclear Engineering, University of Washington, Seattle, WA, June 1969.
M.S. Physics, University of Washington, Seattle, WA, June 1964.
B.A. Engineering Physics, Northwest Nazarene College, June 1961.

Professional Memberships


Dr. Lee Carter coordinated the effort in 1976-77 that combined a number of special-purpose Monte Carlo computer codes, along with an upgrade to an interactive rather than batch computer environment, to obtain the first release of the MCNP computer code that is now utilized extensively throughout the world. This effort launched a user-friendly code, with the powerful features of a point-wise treatment of cross sections in a flexible three-dimensional geometry treatment with accurate simulation of the neutron and photon physics, into a technical community that needed this computational tool for a wide variety of applications.

Other Accomplishments

Publications/Technical Reports

Publications include a book, 14 journal articles, 20 technical reports, and 56 technical meeting publications.


Journal Manuscripts

Technical Reports

Technical Meeting Publications

International Meeting Publications