The Bulgarian boyar families, the Shishmans in Vidin Dormans in Braniċevo, the Asen dynasty and Terter dynasty were of Kuman extraction, and must have settled in these regions after the large immigration of 1241.
Among his students have been Christopher Bouwman, Peter Bree, Frank van Koten, Wolfgang Lange, and Bart Schneemann.
Koten partnered with former President Bill Clinton and the William J. Clinton Foundation to launch the Inner City Economic Initiative, which facilitates mentoring relationships between experienced entrepreneurs and emerging inner city businesses.