Bob Lazar is a very interesting fellow, I think we can say firmly that his education background is lacking and most likely made up. However he is persuasive because his story has remained unchanged for over 20 years and he has passed several polygraph tests. Additionally, he does have some supporting evidence in his favor. George Knapp, for example, interviewed people off the record that remember working with him at Los Alamos. He also interviewed other Area 51 employees and asked them trivial questions like "what color are the walls in the mess hall." When Knapp asked Lazar these same questions, his answers were on par with the verifiable employees. So clearly Bob Lazar was peddling some basic truths. Moreover, people like Boyd Bushman have spoken favorably of Lazar and seem to support him. We also can't forget Ed Teller's odd response to the Bob Lazar questions. Finally, Knapp was able to affirm that Lazar did in fact work at Los Alamos via a subcontractor. He obviously had enough scientific knowledge to work in the field and enough knowledge of Los Alamos to give Knapp a detailed tour of the facility, along with receiving several acknowledgments from those working on-site there. According to Knapp, Lazar was a known commodity there. Knapp's supports Lazar primarily based on this point. That is to say, If Lazar had worked at Los Alamos on government projects, then it is at least conceivable that he worked out at S-4 on more classified projects. Beyond that it gets murky.
So where does that leave us? I tend to believe much of what Bob Lazar has said. I do believe he worked at Los Alamos and probably got the attention of some governmental guys. Here was bright young scientist who probably lied his way into his subcontractor position or talked his way into it without the sort of formal education others had. From there, watchful government employees knew they had a perfect candidate for their plans out at S-4. By choosing Lazar, the government had plausible deniability, based largely on his false education information. In fact they could have used this disparity to actually coax him into the program, i.e., "Listen Lazar, we know you are lying about your education in order to work at Los Alamos. We don't have to remind you that you're working around classified information, this is all end very bad for you. However, what we are offering you here is a deal. You do this for us, we overlook the problems with your background."
Next think you know, Lazar is brought out to S-4, shown some odd technology over the course of a a few weeks, then cut him loose. I am even open to the possibility that while S-4 he could have been exposed to some mind control where they actually implanted his belief that he attended MIT. This would ensure he would emphatically maintain his educational background while the government could easily dismiss him on this basis. As Don stated, if someone believes they did something, then any polygraph machine will read as such.
I am still on the fence about the true nature of the technology Lazar claimed to have seen. I am not sure if this was genuine reversed engineered material or just a cleverly planned dis-information operation. Regardless, it seems like everyone got what they wanted out of the story. Last I heard Lazar has never held a real job, but he does manage to peddle little scientific parts and pieces to government agencies and schools via his United Nuclear. Sort of makes you wonder.