# Alfred Mueller

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**Alfred H. Mueller** (born June 9, 1939) is an American theoretical physicist, and the Enrico Fermi Professor of Physics at [Columbia University](/source/Columbia_University).

Mueller studied at [Iowa State University](/source/Iowa_State_University), receiving a [bachelor's degree](/source/Bachelor's_degree) in 1961 and in 1965 completed his [PhD](/source/PhD) at [MIT](/source/MIT). He then served until 1971 as a post-doc at Brookhaven National Laboratory. Since 1972 he has been at [Columbia University](/source/Columbia_University). He was also a visiting scientist at the Institute for Advanced Study (1975), at the nuclear research centers in Saclay, the [Kavli Institute for Theoretical Physics](/source/Kavli_Institute_for_Theoretical_Physics) at the [University of California, Santa Barbara](/source/University_of_California,_Santa_Barbara), [New York University](/source/New_York_University), and at [SLAC](/source/SLAC).

Among other subjects, Mueller studied the high-order perturbation theory of [quantum chromodynamics](/source/Quantum_chromodynamics) (QCD) and tests of QCD "hard" scattering processes of hadrons and QCD in [nuclear physics](/source/Nuclear_physics) and [heavy ion collisions](/source/High_energy_nuclear_physics). Mueller is a founding father of the field of parton saturation, a theoretically well established idea that the occupation numbers of small-x quarks and gluons cannot become arbitrarily large in the [wave function](/source/Wave_function) of a [hadron](/source/Hadron) or [nucleus](/source/Atomic_nucleus).

He was a [Sloan Research Fellow](/source/Sloan_Research_Fellow) in 1972 and a [Guggenheim Fellow](/source/Guggenheim_Fellow) in 1988. In 2003 he received with [George Sterman](/source/George_Sterman) the [Sakurai Prize](/source/Sakurai_Prize) for the development of concepts of perturbative QCD.[1]

Mueller is also a popular teacher amongst students at Columbia, where he currently teaches the graduate level [Particle Physics](/source/Particle_Physics) course and the undergraduate [Quantum Mechanics](/source/Quantum_Mechanics) course.

## Writings

- with Dokshitzer, Khoze, Troyan: Basics of perturbative QCD. Edition Frontiers 1991

## References

1. ["2003 J. J. Sakurai Prize for Theoretical Particle Physics Recipient"](http://www.aps.org/programs/honors/prizes/prizerecipient.cfm?name=George%20Sterman&year=2003). APS. Retrieved 5 September 2010.

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