h-index (Hirschman index) is bibliometric indicator of the credibility of the scientist, taking into account the dynamics of publication activity and citation.
How to find all publications of a scientist and to calculate h-index, we tell in this recorded seminar, "Search by author": https://www.youtube.com/watch?v=NzleJa0SG14 (the first 25 min. of the video).
Remember that you can always find information about Web of Science and other Thomson Reuters resources on our Russian website wokinfo.com/russian and YouTube channel http://youtube.com/woktrainingsrussian.