Glen Urban is one of the most respected marketing scholar of our time (IMO of course). He began its work on trust quite a while ago (2000 I think). But I am not really aware of its consulting activities.
If you click through its working paper page, you'll find very good pieces of work on trust
http://papers.ssrn.com/sol3/cf_dev/AbsByAuth.cfm?per_id=26102 (the first one seems to be behind paywall but it's not: the working paper version is available for download)