Researchers from Tsinghua University have developed online researcher and topic profiling tool. Online tool provides following features: profile a researcher's publications including h-index, co-authorship network, link semantic analysis between researcher and topics, ranked list of experts, ranked article listing for journals and conferences, and much more.
However, there are few problems such as missing publications, erroneous citations, author disambiguation, and does not allow Boolean searches for example querying for author name and topic (or) author and affiliation. Despite those problems, ArnetMiner is useful tool with good visualizations.
See for yourself, here it the link:
http://arnetminer.org/index.jsp