Shayfaar was a Ferengi trader and "information broker" in the 24th century. He had several encounters with Steve Tecklenberg over the years, and the two held an unusually deep mutual respect for each other. Tecklenberg once saved Shayfaar from something so horrible that, even for a Ferengi, "no amount of latinum could repay the debt."
Timothy Sinclair did not share Tecklenberg's trust of Shayfaar, but nonetheless payed him a visit in 2381, in search of information about Tecklenberg's disappearance. (Star Trek: Pendragon: "A Quiet Darkness")