In this paper weexplore techniquesto minewebpagesof scientists to extract informationregardingtheir expertise, build expertise chains and referral webs, and semi automatically combinethis information with directory information services to create a recommendersystem (ResnickandVarian1997)that permitsqueryby expertise. Weexperimentedwith someexisting techniques that have beenreportedin researchliterature in recentpast (including our ownprior work), and adapted them as needed. We developed software tools to capture and use this information.