You will be given a definition of a task first, then some input of the task.
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: The incident proved stressful for Hendrix, and it weighed heavily on his mind while he awaited trial. His limousine driver and a witness to the arrest, Louis Goldblatt, described him as "genuinely dumbfounded by the whole affair." Tour manager Eric Barrett said that he looked "as if there had been a plane crash". Hendrix biographers Harry Shapiro and Caesar Glebbeek described the incident as "a nightmare which ... plagued" him for seven months. According to Redding, "the bust knocked any positive feelings Jimi was holding onto out of him" and that he was in "agonised suspense" from the arrest until the trial. In 2012, Plummer wrote: "The real possibility of prison hung over Hendrix like a spectre ... a threat to his career and the cause of much brooding and rumination." Journalist Charles Shaar Murray asserted that the incident jeopardized what he described as "Hendrix's increasingly fragile peace of mind".
Two weeks after the arrest, Hendrix told Lawrence: "Whatever I have done ... getting hooked on heroin is not one of them." He explained that his fear of needles discouraged him from using the drug and that having known junkies convinced him that it was not something he should get involved with. Soon after the story of his arrest became public, he drew a connection between the bust and anti-establishment sentiments: "All of that is the establishment fighting back ... Eventually, they will swallow themselves up, but I don't want them to swallow up too many kids as they go along."According to Shapiro and Glebbeek, in 1969 there was little confidence in the staying power of rock stars; it was assumed that their careers were going to be short, and industry insiders operated under a "take the money and run" mentality. For this reason, they speculated that had Hendrix been convicted it would have ended his music career. After the trial, his management announced to the British press that they were planning a farewell tour for the Experience. However, the US tour during which the arrest occurred was their last. The band played their final concert on June 29, at Mile High Stadium in Denver (less than two months before Hendrix's iconic solo performance at Woodstock). There were no new album releases from them during 1969. Hendrix's management later stated that concert promoters were apprehensive about booking him until after the matter had been resolved.
Output:
What is the last name of the person whose limousine driver described him as "genuinely dumbfounded by the whole affair"?