Title: Don (1978 film)
Content: Director: Chandra Barot ; Writer: Salim–Javed (Salim Khan, Javed Akhtar) ; Producer: Nariman A. Irani ; Production Company: Nariman Films ; Cinematographer: Nariman A. Irani ; Editor: Wamanrao ; Art Director: Sudhendu Roy ; Costume Designer: Ramola Bachchan, V. Scharwachter ; Wardrobe: S. Irani, Manikrao Jagtap, Mani J. Rabadi, Mehboob Shaikh ; Stunts: Haji Khan, A. Mansoor ; Choreographer: P. L. Raj ; Music Director: Kalyanji Anandji ; Lyricist: Anjaan, Indeevar ; Playback Singers: Asha Bhosle, Kishore Kumar, Lata Mangeshkar 
Title: Don (character)
Content:  The writer duo Salim–Javed had written a script which they didn't name. They were unsuccessful in selling the script to the producers. It was eventually rejected by Dev Anand, Prakash Mehra and Jeetendra. By that time producer Nariman A. Irani was in huge debts after he produced the film Zindagi Zindagi with Sunil Dutt which turned out to be a huge flop. Amitabh Bachchan, Zeenat Aman, Chandra Barot and Manoj Kumar suggested him to make another film. Then he, along with Barot bought the script from Salim Khan and Javed Akhtar and the script was eventually named Don. According to Javed's son Farhan Akhtar, his version of Don's real name is Mark Donald as per his fictional creations.
Title: Don (2006 Hindi film)
Content:  Principal photography commenced in February 2006 in central Mumbai. Art direction was handled by Aradhana Seth, and the costumes were designed by Aki Narula. Akhtar chose K. U. Mohanan to handle the cinematography after having been impressed by his work in documentaries and commercials. This was Mohanan's first Hindi film as a film cinematographer. To give an authentic feel to the film, scenes were shot on a closed set in actual chawls in real locations. The film was also shot at Film City and Yash Raj Studios. Some filming was done in Paris in March over a 3-day schedule. The filming moved to Kuala Lumpur, Malaysia, in April 2006 
Title: Don (2007 film)
Content:  Don is a 2007 Indian Telugu-language action film produced by M.L. Kumar Chowdary on Sri Keerthi Creations banner and directed by Raghava Lawrence, starring himself along with Nagarjuna and Anushka Shetty, while Nikita Thukral and Kelly Dorji play supporting roles. Raghava Lawrence made his debut as music director for the film. Don released on 20 December 2007 and film was remade in Bangladesh as Don Number One and into Odia as with same name starring Anubhav Mohanty.It was later dubbed into Tamil under the same title.
Title: Don Simpson
Content:  He was a producer in all films unless otherwise noted.
Title: Denise Di Novi
Content:  She was a producer in all films unless otherwise noted.
Title: Don (upcoming film)
Content:  In September 2020, Sivakarthikeyan announced another new project for Lyca Productions with a debutant director hired to helm the project. The project was officially announced on 27 January 2021, which was titled as Don and the actor himself co-produced the film under his Sivakarthikeyan Productions banner. It was directed by Cibi Chakaravarthi, an associate director of Atlee, with Anirudh Ravichander being the music composer. Sivakarthikeyan was rumoured to appear as a school student for few portions in the film, and also reduced weight for his role.
Title: Don (2006 Hindi film)
Content:  Akhtar initially wanted Hrithik Roshan for the titular character, after having worked with him on Lakshya (2004). However, Akhtar felt that the character required a more mature actor, saying he wanted "a face that had seen the world and roughed it out." The director said that Roshan's innocence was not right for the role, and instead cast Shah Rukh Khan for the part that had been portrayed by Amitabh Bachchan in the 1978 film. Akhtar believed that Khan was the most suitable for the role, saying, "He has the personality, the style, the flair, the larger than life persona, the sense of humour and the sheer magnetism that this character requires." In July 2005, Priyanka Chopra was cast to play Roma, 
Title: Don S. Williams
Content:  Don S. Williams (February 11, 1938 – October 28, 2018) was a Vancouver-based Canadian producer, director, actor, choreographer, and writer.
Title: Don (upcoming film)
Content:  Don is an upcoming Indian Tamil-language action-comedy film directed by Cibi Chakaravarthi, in his directorial debut and produced by Allirajah Subaskaran of Lyca Productions. The film stars Sivakarthikeyan in the lead role who also co-produced the film under his Sivakarthikeyan Productions banner, and also co-stars S. J. Suryah, Priyanka Arul Mohan, Samuthirakani and Soori in other prominent roles. The film features music composed by Anirudh Ravichander, with K. M. Bhaskaran and Nagooran handled the cinematography and editing respectively.

Question: Who was the producer of Don?
Answer: Ritesh Sidhwani.