Question: Dr Donald John Pinkava, is a botanist, specialising in cacti and succulents, and he is the discoverer of some of their varieties, at which public metropolitan research university on five campuses across the Phoenix metropolitan area, and four regional learning centers throughout Arizona, he has which position?
Related documents: [0]  [DOC] Arizona State University (commonly referred to as ASU or Arizona State) is a public metropolitan research university on five campuses across the Phoenix metropolitan area, and four regional learning centers throughout Arizona. The 2018 university ratings by "U.S. News & World Report" rank ASU No. 1 among the Most Innovative Schools in America for the third year in a row and has ranked ASU No. 115 in National Universities with overall score of 47/100 with 83% of student applications accepted. [END] 
[1]  [DOC] Dr Donald John Pinkava (born 1933) is a botanist, specialising in cacti and succulents, and he is the discoverer of some of their varieties. He is Professor Emeritus at Arizona State University (ASU). [END] 
Answer: 
Professor Emeritus
Professor Emeritus