thephoenixnyc asked what corporate research is, and the answer was kind of long so I'm posting it here instead of in the comments for my last post:
I had never really thought about this before either - A corporate historian is usually hired on a contract basis to investigate some particular aspect of a companies history. For example, say you have Old Venerable Institution, and they have just undergone a merger with Dynamic Young Upstart. Part of a package that might be put together for example, for shareholders and so forth, might include some history of OVI, and possibly, amalgamating that thematically with the history (recent) of DYU. Ths information could be valuable for marketing and promotion/advertising, shareholder confidence etc. All these things could be done by VOI and or DYU, OR, they could hire a corporate historian to put the information together so they can get on with the business of making money.
Corporate historians are also active in such things as Indian land claims research, and sadly, recent investigations into residential school abuses by the Anglican and Catholic churches. Litigators often hire outside research firms to assist with historical cases.