Professor of Plant Biology, Cornell University

Associate Professor, University of Alabama

Courtesy Professor, Oregon State University

Science Researcher in Systematic Botany, Moscow State University, Russia

Research Associate in the Botany Department, Nelson Mandela Metropolitan University

Royal Botanic Gardens, Kew

Musée national d'histoire naturelle, Luxembourg

Assistant Professor - São Paulo State University (Unesp/Rio Claro)

National Coalition of Independent Scholars

Assistant Professor in Botany, Guru Nanak College, Sri Muktsar Sahib (Punjab) India