Dr. Stefano Terlizzi is the John and Jean M. Brennan Clean Energy Early Career Professor at Pennsylvania State University (PSU). Prior to joining PSU, he was a staff scientist at Idaho National Laboratory (INL), where he led multiple projects on advanced reactor analysis and the development of analytical tools supporting agencies such as the U.S. Department of Energy (DOE), NASA, and the Nuclear Regulatory Commission (NRC).

He holds a Ph.D. in nuclear engineering from the Georgia Institute of Technology, as well as a B.S. and M.S. in energy engineering and energy & nuclear engineering, respectively, from the Polytechnic University of Turin. Dr. Terlizzi previously served as the INL Deslonde De Boisblanc Distinguished Postdoctoral Research Associate and was a fellow in the Georgia Tech Sam Nunn Security Program.

• B.S., Energy Engineering, Politecnico di Torino, 2013
• M.S., Energy and Nuclear Engineering, Politecnico di Torino, 2015
• PhD, Nuclear Engineering, Georgia Institute of Technology, 2020

Journal Articles

Shikhar Kumar, Changho Lee, Vincent Laboure', Yeon Sang Jung, Stefano Terlizzi, Yaqi Wang and Javier Ortensi, 2026, "Transient multiphysics simulations with pin power reconstruction in the Griffin reactor physics code", Annals of Nuclear Energy, 230

Guillaume Giudicelli, Fande Kong, Roy Stogner, Logan Harbor, Derek Gaston, Alexander Lindsay, Zachary Prince, Lise Charlot, Stefano Terlizzi, Mahmoud Eltawilla and April Novak, 2025, "Data Transfers for Nuclear Reactor Multiphysics Studies Using the MOOSE Framework", Frontiers of Nuclear Engineering, 4, (1611173)

Nelson Snow, Sweet Shanahan, Quinton Williams, Ishita Trivedi, Emerald Ryan, Stefano Terlizzi, Camille Palmer and Ryan Stewart, 2025, "Preliminary Studies on Diversion and Misuse for Triso-Fueled Heat-Pipe-Cooled Microreactors", Annals of Nuclear Energy, 217, (111309)

Isaac Naupa Aguirre, Samuel Garcia, Ben Lindley, Stefano Terlizzi and Dan Kotlyar, 2025, "Validation and Verification of Serpent-Griffin Computational Sequence Using the SNAP 8 Experimental Reactor Dry Experiments", Nuclear Science and Engineering, 200, (2)

Emerald D Ryan, Ishita Trivedi, Stefano Terlizzi, Ashley Shields, Mark Schanfein, Gustavo Reyes and Ryan Stewart, 2024, "Challenges and Technology-Driven Opportunities for Safeguarding Microreactors", Nuclear Science and Engineering

Stefano Terlizzi and Vincent Laboure, 2023, "Asymptotic hydrogen redistribution analysis in yttrium-hydride-moderated heat-pipe-cooled microreactors using DireWolf", Annals of Nuclear Energy, 186, pp. 109735

Vincent Laboure, Sebastian Schunert, Stefano Terlizzi, Zachary Prince, Javier Ortensi, Ching-Shen Lin, Lise Charlot and Mark DeHart, 2023, "Automated Power-Following Control for Nuclear Thermal Propulsion Startup and Shutdown Using Moose-Based Applications", Annals of Nuclear Energy, 161, pp. 104710

Guillaume L Giudicelli, Abdalla Abou-Jaoude, April J Novak, Ahmed Abdelhameed, Paolo Balestra, Lise Charlot, Jun Fang, Bo Feng, Thomas Folk, Ramiro Freile, Stefano Terlizzi and other, 2023, "The virtual test bed (VTB) repository: a library of reference reactor models using NEAMS tools", Nuclear Science and Engineering, 197, (8), pp. 2217--2233

Stefano Terlizzi and Dan Kotlyar, 2022, "A perturbation-based acceleration for Monte Carlo--Thermal Hydraulics Picard iterations. Part II: Application to 3D PWR-based problems", Annals of Nuclear Energy, 166, pp. 108713

Stefano Terlizzi and Dan Kotlyar, 2022, "A perturbation-based acceleration for Monte Carlo – Thermal Hydraulics Picard iterations. Part I: Theory and application to extruded BWR unit-cell.", Annals of Nuclear Energy, 167, pp. 108756

Naiki Kaffezakis, Stefano Terlizzi, Corey Smith, Anna S Erickson, Shannon K Yee and Dan Kotlyar, 2020, "High temperature ultra-small modular reactor: Pre-conceptual design", Annals of Nuclear Energy, 141, pp. 107311

Andrew E Johnson, Dan Kotlyar, Stefano Terlizzi and Gavin Ridley, 2020, "serpentTools: A python package for expediting analysis with serpent", Nuclear Science and Engineering, 194, (11), pp. 1016--1024

Stefano Terlizzi and Dan Kotlyar, 2019, "Fission matrix decomposition method for criticality calculations: Theory and proof of concept", Nuclear Science and Engineering, 193, (9), pp. 948--965

Conference Proceedings

James Alexander Nellis, Jeoffrey Doreville, Paul Romano and Stefano Terlizzi, 2025, "Extension of the Iterated Fission Probability Implementation in OpenMC to Calculate Multi-Precursor Point Kinetics Parameters", Transactions of the American Nuclear Society

Isaac Naupa Aguirre, Stefano Terlizzi and Mark DeHart, 2025, "Serpent - BISON - THM Preliminary Multiphysics Modeling of a Nuclear Thermal Propulsion System Fuel Assembly", Proceedings of the International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)

Guillaume Giudicelli, Fande Kong, Roy Stogner, Logan Harbour, Derek Gaston, Stefano Terlizzi and Zachary Prince, 2024, "Data transfers for full core heterogeneous reactor high-fidelity multiphysics studies", 302, pp. 05006

Stefano Terlizzi and Ishita Trivedi, 2024, "Progress toward the development of a high-fidelity neutronic model of MARVEL using Griffin", pp. 2554--2560

Farha Farhana, Joshua Hanophy, Brendan Kochunas, Sebastian Schunert and Stefano Terlizzi, 2024, "Proof-of-Concept for Sensor Modeling in MOOSE for the Design of Autonomous Nuclear Reactor Control", Transactions of the American Nuclear Society, American Nuclear Society, 131, (1), pp. 322--325

Sweet Shanahan, Nelson Snow, Quinton Williams, Camille Palmer, Stefano Terlizzi, Ishita Trivedi and Ryan Stewart, 2024, "Select Proliferation Studies on TRISO-fueled, Heat-Pipe-cooled Microreactors", Transactions of the American Nuclear Society, American Nuclear Society, 131, (1), pp. 841--844

Lise Charlot, Emily Shemon, Guillaume Giudicelli, Samuel Walker, Jun Fang, Tingzhou Fei, Hansol Park, Yiqi Yu, Shikhar Kumar, Nicolas Stauff, Ahmed Abdelhameed, Paolo Balestra, Mustafa Jaradat, Namjae Choi, Javier Ortensi, Vasileios Kyriakopoulos, Mauricio Tano Retamales, Stefano Terlizzi, Joshua Hansel, Vincent Laboure and Abdalla Abou-Jaoude, 2024, "Status of New Models Hosted on the Virtual Test Bed (VTB) in 2024", Transactions of the American Nuclear Society, American Nuclear Society, 131, (1), pp. 1072--1075

Vincent M Laboure, Stefano Terlizzi and Sebastian Schunert, 2023, "Hybrid Temperature-Reactivity PID Controllers for Nuclear Thermal Propulsion Startup", pp. 38-43

Quentin David Faure, Vincent M Laboure and Stefano Terlizzi, 2023, "Preliminary Results for Uncertainty Quantification on Asymptotic Hydrogen Redistribution in a Prototypical Yttrium-Hydride Moderated Heat-Pipe-Cooled Microreactor", Transactions of the American Nuclear Society, 129, (1), pp. 447-450

Bailey Painter, Dan Kotlyar and Stefano Terlizzi, 2023, "Preliminary Monte Carlo and Thermal Hydraulic Analysis using a Hybrid ETF-Corrected-Diffusion Prediction Block"

Isaac Naupa Aguirre, Sam Garcia, Ben Lindley, Stefano Terlizzi, Abdalla Abou Jaoude and Dan Kotlyar, 2023, "Verification of the Serpent-Griffin Workflow using the SNAP 8 Experimental Reactor", (INL/CON-22-69994-Rev001)

Bailey Painter, Stefano Terlizzi and Dan. Kotlyar, 2022, "Accelerated Coupled Monte Carlo-Thermal Hydraulic Calculations using a Hybrid GTF-Diffusion-based Prediction Block: First Results"

Stefano Terlizzi, Vincent Laboure and Dehart Mark, 2022, "Preliminary Observations on the Hydrogen Redistribution Feedback in YH-Moderated Monolithic Microreactors"

Stefano Terlizzi, Labour\'e, Vincent and Mark DeHart, 2022, "Selected results from full-core hydrogen redistribution asymptotic analysis in YH-moderated heat-pipe cooled microreactor"

Noah Higgins, Sebastian Schunert, Stefano Terlizzi, Ching-Sheng Lin, Vincent Laboure and Mark DeHart, 2021, "Modelling Nuclear Thermal Propulsion Reactor Startup Transients"

Stefano Terlizzi and D Kotlyar, 2020, "ON THE FLY PREDICTION OF TH-DEPENDENT SPATIAL MACROSCOPIC CROSS-SECTIONS USING FFT", EPJ Web of Conferences

Stefano Terlizzi and D Kotlyar, 2019, "VERIFICATION OF THE FISSION MATRIX DECOMPOSITION METHOD AGAINST TWO AXIALLY HETEROGENEOUS PROBLEMS"

Stefano Terlizzi and Dan Kotlyar, 2018, "Non-Ideal Convergence of the Fission Matrix Fundamental Eigen-Pair in Monte Carlo Calculations", pp. 22--26

Stefano Terlizzi, Sandra Dulla, Piero Ravetto, Farzad Rahnema and Dingkang Zhang, 2015, "Development of a hybrid deterministic/stochastic method for 1D nuclear reactor kinetics", 1702, (1)

• American Nuclear Society 40 under 40, American Nuclear Society, 2025 - 2026

• Deslonde de Boisblanc Distinguished Postdoctoral Appointment, Idaho National Laboratory, February 2021 - February 2022

• Sam Nunn Security Program Fellowship, John D. and Catherine T. MacArthur Foundation, 2018 - 2019

• John J. and Jean M. Brennan Clean Energy Early Career Professorship, July 2024

Service to Penn State:

• Assessment Activities, Member, Radiation Science and Engineering Center (RSEC), Penn State Reactor Safeguards Committee (PSRSC), January 2025 - January 2028

Service to External Organizations:

• Participation in or Service to Professional and Learned Societies, Executive Committee, American Nuclear Society, 2023