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** Klaus Hepp ** (born 11 December 1936) is a German-born Swiss theoretical physicist working mainly in quantum field theory. Hepp studied mathematics and physics at Westfälischen Wilhelms-Universität in Münster and at the Eidgenössischen Technischen Hochschule (ETH) in Zurich, where, in 1962, with Res Jost as thesis first advisor and Markus Fierz as thesis second advisor, he received a doctorate for the thesis ("Kovariante analytische Funktionen“) and at ETH in 1963 attained the rank of Privatdozent. From 1966 until his retirement in 2002 he was professor of theoretical physics there. From 1964 to 1966 he was at the Institute for Advanced Study in Princeton. Hepp was also Loeb Lecturer at Harvard and was at the IHÉS near Paris.

Klaus Hepp | |
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Born | |

Nationality | Swiss |

Alma mater | ETH Zurich |

Scientific career | |

Fields | Theoretical physics |

Institutions | ETH Zurich |

Doctoral advisor | Res Jost |

Doctoral students | Jürg Fröhlich Konrad Osterwalder José Fernando Perez Walter F. Wreszinski |

Hepp worked on relativistic quantum field theory, quantum statistical mechanics, and theoretical laser physics.^{[1]} In quantum field theory he gave a complete proof of the Bogoliubov–Parasyuk renormalization theorem (Hepp and Wolfhart Zimmermann, called in their honor the BPHZ theorem).^{[2]} Since a research stay 1975/6 at MIT he also worked in neuroscience (for example, reciprocal effect between movement sensors, visual sense and eye movements with V. Henn in Zurich).

In 2004 he received the Max Planck Medal.

- “Renormalisaton Theory“, in de Witt, Stora „Statistical Mechanics and Quantum Field Theory“, Gordon and Breach, New York 1971
- “Progress in Quantum Field Theory“, Erice Lectures 1972
- “Theorie de la Renormalisation“, Springer 1970
- “On the quantum mechanical N-body problem“, Helvetica physica Acta, Bd.42, 1969, S.425
- “On the connection between Wightman and LSZ quantum field theory“, in Chretien, Deser „Axiomatic Quantum Field Theory“, New York 1966
- "Quantum mechanics in the brain" (with Christof Koch) in
*Nature*440(611), 2006

**^**Hepp, Klaus; Lieb, Elliott (1973). "On the superradiant phase transition for molecules in a quantized radiation field: the Dicke Maser Model".*Annals of Physics*.**76**(2): 360–404. Bibcode:1973AnPhy..76..360H. doi:10.1016/0003-4916(73)90039-0.**^**Hepp, Klaus (1966). "Proof of the Bogoliubov-Parasiuk theorem on renormalization".*Communications in Mathematical Physics*.**2**(1): 301–326. Bibcode:1966CMaPh...2..301H. doi:10.1007/BF01773358. S2CID 119578052.

- Klaus Hepp at the Mathematics Genealogy Project
- Hepp Biographie an der ETH
- DPG zur Verleihung der Max Planck Medaille