mathematicians 21st-century American mathematicians Geometers Differential geometers University of Bucharest alumni Academic staff of the University of Bucharest California State University, Fullerton people California State University, Fullerton faculty Michigan State University alumni 1969 births Living people Male essayists 20th-century short story writers 21st-century short story writers 20th-century essayists 21st-century essayists 20th-century Romanian male writers 21st-century male writers