Web of Science contains the three historical leaders in citation indexing:Science Citation Index, Social Sciences Citation Index, and Arts and Humanities Citation Index. You can search all three index together or separately from the Web of Science interface.
The search features of Web of Science are very robust as are the sorting and filtering options of search results.
To locate papers by a particular author use the Author Finder.
Once you locate a citation of interest, you can export it to a bibliographic manager such as RefWorks, view all indexed articles which cite the original, as well as create reports and maps which visualize citations over time.