Biographical Information


BS Physics/Chemistry : Purdue University, May, 1973

MS Physics : University of Wisconsin , August, 1975

PhD Physics : University of Wisconsin, August, 1979

Thesis advisor was Professor L.W. Bruch.

Thesis : Calculation of Local Fields in Cubic Lattices of Polarizable Atoms
This work modeled a dielectric as a lattice of Drude oscillators and investigated
The normal modes in zero external fields
The response of the system to a uniform electric field
The response of the system to an external point charge


Employment History

August 1983-Present : Instructor at Madison Area Technical College  
Math/Science instructor 1983-1985
Math instructor 1983-present
Lead Math instructor 1986-1990


September 1981-August 1983 : Lead Project Engineer at Ray-O-Vac Corporation's R&D Center.
Responsible for the design and experimental testing of Li - thionyl chloride cells and silver oxide cells. Extensive work in fractional factorial experimental designs and statistical analysis

August 1979-August 1981 : postdoctoral Research Associate for the Department of Physics and Astronomy at the University of North Carolina at Chapel Hill. 
Performed theoretical studies of solid and liquid electrolytes. The work involved analytical modeling as well as computer simulations and fitting of experimental impedance data to equivalent circuit models. This work was done under the supervision of Professor J. Ross MacDonald

September 1973-August 1979 : Graduate student working on Masters and PhD degrees. Was a teaching assistant
for the Physics Department from 9/75 to 5/76 and from 1/79 to 5/79
for the Chemistry Department from 9/73 to 5/74

Professional Memberships

American Physical Society

The Mathematical Association of America

American Mathematical Association of Two-Year Colleges

The Wisconsin Math Council

"The Sphere Game", A.P. Lehnen, G. E. Wessenberg, The AMATYC Review 25, 25 (2003).
"Finite length effects in a lattice gas treatment of an ionic crystal having Frenkel or Schottky disorder", A.P. Lehnen, J.R. MacDonald, Crystal Lattice Defects 9,149 (1982).
"The applicability and power of complex nonlinear least squares for the analysis of impedance and admittance data", J.R. MacDonald, J. Schoonman, A.P. Lehnen, J. Electroanal. Chem. 131, 77 (1982).
"Mean field effects in a lattice gas model of ionic space charge", J.R. MacDonald, A.P. Lehnen, D.R. Franceschetti, J. Phys. Chem. Solids 43, 39 (1982).
"Analysis of hydrogen doped lithium nitride admittance data", J.R. MacDonald, A. Hooper, A.P. Lehnen, Solid State Ionics 6, 65 (1982).
"Interacting lattice gas approach to space charge distributions", J.R. MacDonald, D.R. Franceschetti, A.P. Lehnen, Solid State Ionics 5, 105 (1981).
"Three dimensional perspective plotting and fitting of immittance data", J.R. MacDonald, J. Schoonman, A.P. Lehnen, Solid State Ionics 5, 137 (1981).
"Interfacial space charge and capacitance in ionic crystals", J.R. MacDonald, D.R. Franceschetti, A.P. Lehnen, J. Chem. Phys. 73, 5272 (1980).
"Response of a semi-infinte cubic lattice to a static point charge", A.P. Lehnen, L.W. Bruch, Phys. Rev. B 21, 3193 (1980).
"Response of a semi-infinte cubic lattice to uniform electric fields", A.P. Lehnen, L.W. Bruch, Physica 100A, 215 (1980).
"Statistical model calculations of atomic polarizabilities", L.W. Bruch, A.P. Lehnen, J. Chem. Phys. 64, 2065 (1976).

Personal Information

I am married to Gwen Ruth Treleven and we have a beautiful daughter, Natalie. I also have three other wonderful children, Brian, Becca and Sarah. Life would be so empty without the meaning your children give it