Emeritus, Earth and Atmospheric Sciences
Member of the US National Academy of Sciences (NAS), Guggenheim Fellow
1964-65, National Science Foundation Postdoctoral Fellow, Senckenberg Museum, Germany
1972-73, Guggenheim Fellow, Giessen, Germany, Imperial College, London, Indiana University, Bloomington, IN
1978-88, Guggenheim Fellow, British Museum of Natural History, Indiana University, Bloomington, IN
1989, Elected, Member of the American National Academy of Sciences, Washington D.C., USA
2007, Honorary Doctor of Science Degree, Honoris Causa, from Lyon University, Lyon, France
2009, Honorary Doctor of Science Degree, Honoris Causa, from University of Minnesota, Minneapolis, Minnesota, U.S.A.
2009, National Friendship Award given by the Central Government of People's Republic of China for contributions and dedication to China
1981, Elected Fellow of the Indiana Academy of Science
1982, Elected Fellow of the Linnean Society of London
1986, Selected as a Visiting Scholar by The Committee on Scholarly Exchange to The People’s Republic of China, by the National Academy of Science of the United States of America
1987-88, Sonneborn Award, Indiana University for combining both Distinguished Teaching and Research
1988, Distinguished Visiting Scholar at University of Adelaide, Australia
1990, Birbal Sahni Institute of Palaeobotany Visiting Scholar, Lucknow India
1991, Merit Award in recognition of outstanding Research and Service given by the Botanical Society of America
1990, Corresponding Member of the Senckenberg Museum of Natural History, Frankfurt, Germany
1998, Honorary Professor, Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing, China
1998, Received the University of Florida PEP (Professorial Excellence Program) award.
2001, Honorary Professor, Jilin University, Changchun, China
2005, Honorary Professor, Shenyang Normal University, Shenyang, Lanzhou University, Lanzhou, China
2006, Changbaishan Friendship Award, Government of Jilin Province, China
2006, Botanical Society of America Centennial Award
2006, Palaeobotanical Society International Medal for outstanding contributions to Palaeobotany, Lucknow, India
2004, Research Foundation Professor, University of Florida
2011, Honorary Dean of the College of Paleontology, Shenyang Normal University, Shenyang, China
1964-1965 N.S. F. Postdoctoral Fellow, Senckenberg Museum of Natural History, Frankfurt am Main, Germany
1965-1966, Lecturer Department of Biology, Yale University
1966 - 1990, Assistant, Associate and Full Professor, Departments of Biology and Geology, Indiana University
1990-2009, Adjunct Professor in Biology and Geology Departments, Indiana University
1990-2009, Graduate Research Professor, University of Florida
2010-present, Professor Emeritus, Department of Geology and Department of Biology, Indiana University
The College of Arts