June 1-14, 1986 |
Boundary Conditions and the Structure of the VacuumNATO Advanced Study Institute on the Physics of Strong Fields, Maratea, ITALY. |

October 28-29, 1988 |
845th Meeting of the American Mathematical Society: Special Session on Geometry and Mathematical Physics, Lawrence, KS, USA. |

June 12-28, 1991 |
Soviet-American Workshop on Mathematical Physics with Emphasis on Strings (Part I), Berkeley, CA, USA. |

February 11, 1997 |
When Do Rotating Detectors Click?Five College Colloquium Series, Mount Holyoke College, South Hadley, MA USA. |

April 19-20, 1997 |
921st Meeting of the American Mathematical Society:
Special Session on Octonions and Clifford Algebras,
Corvallis, OR, USA.
Co-organizer & Invited Talk |

October 31, 2002 |
What does Geometry tell us about the Universe?Scholars' Convocation, Grinnell College, Grinnell, IA, USA, (with Tevian Dray). |

July 29, 1988 |
Octonions & SuperstringsDepartment of Mathematical Sciences Research Seminar, University of Durham, Durham, UK. |

November 16, 1989 |
The Klein Paradox and Superradiance
(Rolling Relativistic Balls Uphill)Physics Department Colloquium, Reed College, Portland, OR, USA. |

April 23, 1990 |
The Rotating VacuumPhysics Department Colloquium, Portland State University, Portland, USA. |

July 18, 1990 |
Octonions & SuperstringsPhysics Department Seminar, The University of Crete, Heraklion, Greece. |

May 16, 1991 |
Octonions & SuperstringsResearch Seminar, Mathematical Sciences Research Institute, Berkeley, CA, USA. |

June 4, 1991 |
Octonions & SuperstringsColloquium, Jet Propulsion Laboratory, Pasadena, CA, USA. |

February 12, 1992 |
Rolling Relativistic Quantum Balls UphillDepartment of Physics Colloquium, Lewis & Clark College, Portland, OR, USA. |

February 27, 1992 |
Lorentz Transformations & SuperstringsPhysics & Mathematics Department Colloquium, Mount Holyoke College, South Hadley, MA, USA. |

April 20, 1992 |
Rolling Relativistic Quantum Balls UphillDepartment of Physics Colloquium, Linfield College, McMinnville OR, USA. |

September 15, 1993 |
The Klein ParadoxSchool of Physics & Materials, Lancaster University, Lancaster, UK. |

December 6, 1994 |
Symmetries and OctonionsDepartment of Physics, The University of Newcastle, Newcastle-upon-Tyne, UK. |

December 8, 1994 |
Symmetries and OctonionsDepartment of Mathematics, The University of York, York, UK. |

March 24, 1995 |
Symmetries and OctonionsDepartment of Mathematical Physics, The University of Adelaide, Adelaide, Australia. |

May 18, 1995 |
The Trousers ProblemPhysics and Mathematical Physics Department Colloquium, The University of Adelaide, Adelaide, Australia. |

July 14, 1995 |
Symmetries and OctonionsDepartment of Physics, Australian National University, Canberra, Australia. |

July 17, 1995 |
The Trousers ProblemDepartment of Applied Mathematics, University of Sydney, Sydney, Australia. |

February 20, 1997 |
Octonions, Symmetries, and SuperstringsThe Evergreen State College, Olympia, WA, USA. |

February 20, 1997 |
Quantum Gravity and Superstring TheoryThe Evergreen State College, Olympia, WA, USA. |

April 10, 1998 |
Rolling Relativistic Quantum Balls UphillDepartment of Physics Seminar, Southern Oregon University, Ashland, OR, USA. |

November 3, 1998 |
Rolling Relativistic Quantum Balls UphillDepartment of Physics Seminar, Pacific Lutheran University, Tacoma, WA, USA. |

May 6, 1999 |
Octonions and SuperstringsLinfield College Physics Colloquium, Linfield College, McMinnville, OR, USA. |

July 8, 1999 |
Dimensional ReductionJoint ICTP/SISSA Mathematical Physics Seminar, SISSA, Trieste, ITALY. |

July 15, 1999 |
Dimensional ReductionInstituut-Lorentz for Theoretical Physics, Universiteit Leiden, Leiden, THE NETHERLANDS. |

April 17, 2000 |
Octonions & SymmetriesPhysics Department Seminar, Gustavus Adolphus College, Saint Peter, MN, USA. |

July 24-29, 2000 |
Octonions & SuperstringsOctoshop III, York, ENGLAND. |

October 9, 2001 |
Octonions and SpinPhysics Department Seminar, Grinnell College, Grinnell, IA, USA. |

January 31, 2002 |
Octonions and FermionsPhysics Symposium, Mount Holyoke College, South Hadley, MA, USA. |

March 4, 2002 |
Rolling Relativistic Quantum Balls UphillDepartment of Physics, Mount Holyoke College, South Hadley, MA, USA. |

April 4, 2002 |
Octonions and FermionsPhysics Department Seminar, Amherst College, Amherst, MA, USA. |

April 26, 2002 |
Octonions and FermionsHigh Energy/Nuclear Seminar, University of Massachusetts, Amherst, MA, USA. |

September 17, 2002 |
Rolling Relativistic Quantum Balls UphillPhysics Seminar, Grinnell College, Grinnell, IA, USA. |

November 19, 2002 |
Octonions and FermionsMathematical Physics Seminar, Departments of Mathematics and Physics/Astronomy, University of Iowa, Iowa City, IA, USA, (with Tevian Dray) |

October 6, 2003 |
Rolling Relativistic Quantum Balls UphillPhysics Colloquium University of Portland, Portland, OR, USA. |

April 14, 2004 |
Octonions and FermionsParticle-Astrophysics Seminar, Case Western Reserve University, Cleveland, OH, USA. |

December 7, 2004 |
Octonionic SymmetrySeminar Perimeter Institute for Theoretical Physics, Waterloo, Ontario, CA. |

*Last Update: 12/26/05*