He has authored more than 250 journal articles and book chapters and has supervised more than 50 doctoral dissertations and supervised several postdoctoral research fellows. Dr. Troost has been invited to deliver plenary lectures at major conferences in Europe, Asia, Africa, North America, South America, Australia, New Zealand, South Africa, Israel, Germany, Austria, Switzerland, England, Japan, Poland, Spain, Italy, France, Sweden, Denmark , Canada , the United States , Mexico , Colombia , Brazil , Argentina , Chile , Venezuela .