Unknown? Rutkowska has done some of the most interesting security research in virtualization security, including most famously the "Blue Pill" and "Red Pill" demonstrations - escalating privileges to Dom0 (and detection of presence of a hypervisor by the client). For both HVM and PV architectures (e.g., Windows & Xen), she and her colleagues have done ground-breaking work that have impacted the implementation of every major commercial and open source virtualization.

Academic pubs != Relevance

Edit: But since you asserted it, here are researchers that cite her work (over 130, including IEEE and ACM folk):

http://scholar.google.com/scholar?cites=13610021170603453007...