Albert Baernstein II (25 April 1941, Birmingham, Alabama – 10 June 2014, University City, Missouri) was an American mathematician.
After working for a year for an insurance company, he became a graduate student in mathematics at the University of Wisconsin-Madison, where he received his master's degree in 1964 and Ph.D. in 1968.
[3] The main focus of Baernstein's was analysis, especially function theory and symmetrization problems.
He originally introduced the star-function to solve an extremal problem posed by Albert Edrei in Nevanlinna theory.
[3] In 1978 he was an Invited Speaker with talk How the *-function solves extremal problems at the ICM in Helsinki.