Background: Jonas Edward Salk (; October 28, 1914 - June 23, 1995) was an American medical researcher and virologist. He discovered and developed one of the first successful polio vaccines. Born in New York City, he attended New York University School of Medicine, later choosing to do medical research instead of becoming a practicing physician. In 1939, after earning his medical degree, Salk began an internship as a physician scientist at Mount Sinai Hospital.
Context: After City College, Salk enrolled in New York University to study medicine. According to Oshinsky, NYU based its modest reputation on famous alumni, such as Walter Reed, who helped conquer yellow fever. Tuition was "comparatively low, better still, it did not discriminate against Jews, ... while most of the surrounding medical schools--Cornell, Columbia, University of Pennsylvania, and Yale--had rigid quotas in place." Yale, for example, accepted 76 applicants, in 1935, out of a pool of 501. Although 200 of the applicants were Jewish, only five got in. During his years at New York University Medical School, Salk worked as a laboratory technician during the school year and as a camp counselor in the summer.  During Salk's medical studies, he stood out from his peers, according to Bookchin, "not just because of his continued academic prowess--he was Alpha Omega Alpha, the Phi Beta Kappa Society of medical education--but because he had decided he did not want to practice medicine." Instead, he became absorbed in research, even taking a year off to study biochemistry. He later focused more of his studies on bacteriology which had replaced medicine as his primary interest. He said his desire was to help humankind in general rather than single patients. "It was the laboratory work, in particular, that gave new direction to his life."  According to Salk: "My intention was to go to medical school, and then become a medical scientist. I did not intend to practice medicine, although in medical school, and in my internship, I did all the things that were necessary to qualify me in that regard. I had opportunities along the way to drop the idea of medicine and go into science. At one point at the end of my first year of medical school, I received an opportunity to spend a year in research and teaching in biochemistry, which I did. And at the end of that year, I was told that I could, if I wished, switch and get a Ph.D. in biochemistry, but my preference was to stay with medicine. And, I believe that this is all linked to my original ambition, or desire, which was to be of some help to humankind, so to speak, in a larger sense than just on a one-to-one basis."  Concerning his last year of medical school Salk says: "I had an opportunity to spend time in elective periods in my last year in medical school, in a laboratory that was involved in studies on influenza. The influenza virus had just been discovered about a few years before that. And, I saw the opportunity at that time to test the question as to whether we could destroy the virus infectivity and still immunize. And so, by carefully designed experiments, we found it was possible to do so."
Question: Did he collaborate with anyone?
Answer: 

Background: Ranveer Singh Bhavnani (born 6 July 1985) is an Indian actor who appears in Hindi films. He is the recipient of several awards, including two Filmfare Awards, and is among the highest-paid actors in the country. After completing a bachelor's degree from Indiana University Bloomington, Singh returned to India to pursue his career in films. He made his acting debut in 2010 with a leading role in Yash Raj Films' romantic comedy Band Baaja Baaraat.
Context: In January 2010, Singh was called for an audition by Shanoo Sharma, the head of the casting division for Yash Raj Films. They informed him that it was for a lead role in their film titled Band Baaja Baaraat, a romantic comedy set in the world of wedding planning. Aditya Chopra, the vice president of the company, later saw the audition tapes on video and was impressed by Singh's acting, and decided that he fit the part of Bittoo Sharma, the hero of the film. However, the director Maneesh Sharma needed some more convincing and he was called for a few more auditions over the next two weeks until they were completely convinced of his caliber. After the two weeks of testing, Singh was confirmed for the role of Bittoo, with Anushka Sharma playing the female lead.  Singh described the role of Bittoo Sharma as a typical Delhi boy. To prepare for the role, he spent time with students at the Delhi University campus. Prior to the release of the film, trade analysts were skeptical of the film's commercial potential, citing the middling response to Yash Raj Films' last few productions, the lack of a male star and the fact that the female lead, Anushka Sharma, was by then an "almost-forgotten" actress. However, Band Baaja Baaraat went on to become a sleeper hit. Singh's portrayal of Bittoo was praised, with Anupama Chopra of NDTV writing that Singh was "pitch perfect in the role of the uncouth but good-hearted small town slacker who is a bit of a duffer when it comes to matters of the heart." The film earned approximately Rs214 million (US$3.3 million) at the domestic box office. At the 56th Filmfare Awards, Singh won the award for Best Male Debut.  Following Band Baaja Baarat, Singh signed on for Ladies vs Ricky Bahl, a romantic comedy produced by Chopra and directed by Maneesh Sharma. He played a conman Ricky Bahl who cons girls for a living but finally meets his match. The film co-starred Anushka Sharma, Parineeti Chopra, Dipannita Sharma and Aditi Sharma. According to Singh, the title character had various avatars in the film, including a chirpy, entertaining side and a sinister side. Nikhat Kazmi of The Times of India wrote, "Ranveer is, well Ranveer: your average Joe kind of hero who looks convincing enough as Sunny, Deven, Iqbal, Ricky, his sundry avatars." Commercially, Ladies vs Ricky Bahl earned Rs370 million (US$5.7 million) domestically.
Question: was he in other movies previously?
Answer:
He played a conman Ricky Bahl who cons girls for a living but finally meets his match. The film co-starred Anushka Sharma, Parineeti Chopra,