Between 1999 and 2003, Leistner worked with the Institute for Knowledge Management led by IBM. In 2003, he was invited to the Harvard Graduate School of Education Learning Innovation Laboratory (LILA) roundtable. From 2005 to 2009, he worked with the Babson Working Knowledge Center, led by Thomas Davenport and Laurence Prusak, two of the key pioneers of knowledge management. He was a member of the board of the Swiss Knowledge Management Forum (SKMF). He presented at numerous conferences and delivered keynotes in Europe and the United States about knowledge management, talent management, and social media topics.