Short answers, pulled from the story.
Sony Pictures Home Entertainment was founded in June 1978. The company originally operated under the name Columbia Pictures Home Entertainment before undergoing multiple rebranding efforts over the decades.
The joint venture with RCA ended in August 1991 after litigation filed by NBC in March 1990. Sony renamed the company Columbia TriStar Home Video following the closure of the deal and the divestment of RCA interests by General Electric.
Sony Pictures Home Entertainment ended its distribution deal with MGM on the 31st of May 2006. The company transferred most of MGM's output to 20th Century Fox Home Entertainment following the failure of the partnership.
Sony Pictures Home Entertainment created sub-labels such as Magic Window for children's titles and SVS-Triumph for low-profile releases. The company also established international labels including 20/20 Vision for the British rental market and Screen Classics by Request for on-demand classic films.
Sony Pictures Home Entertainment announced the release of Ultra HD Blu-ray titles on the 20th of November 2015. This move marked a significant step in the company's commitment to high-quality home entertainment formats.
Keith LeGoy replaced Man Jit Singh as president of Sony Pictures Home Entertainment on the 6th of February 2018. Man Jit Singh had previously taken over the role from David Bishop in 2014.