Short answers, pulled from the story.
Henry Evans (c. 1543 - after 1612) was a Welsh scrivener and theatrical producer who organised the Children of the Chapel and the Children of Paul's at Blackfriars Theatre in 1583-84, and later led a consortium that leased the theatre again from 1599 to 1608. Theatre historian David Grote describes him as an "unsavoury" and "devious" character.
Henry Evans was responsible, apparently in collaboration with John Lyly, for organising boy players at Blackfriars Theatre during the 1580s. He later led a group of investors who leased the theatre a second time from 1599 until 1608, when a diplomatic scandal forced him to surrender the lease to the Burbages.
French ambassador Antoine Lefèvre de la Boderie complained to King James I in 1608 about plays by George Chapman that allegedly mocked the French court, and about a separate play that reportedly depicted James himself as a drunk. James ordered that the Blackfriars children should "never play more," and Evans was forced to return the lease to the Burbages.
It has been suggested that Evans may have written the Famous Victories of Henry V during the 1580s, a play now recognised as one of the principal models for Shakespeare's later plays on the life of Henry. The authorship of the play remains uncertain.
Evans installed young choristers at Blackfriars and set aside part of the building for their education, allowing him to claim the theatre was legally a school. His partner Nathaniel Giles held a royal warrant to recruit performers for the queen's entertainment, which Evans used to take talented children from local grammar schools. In 1600, the father of one child sued Evans for forcing his son to join the troupe.
Evans had an indirect influence in two ways. His company of boys was seen as a rival to the King's Men, a tension apparently reflected in Hamlet. His 1599 lease also generated income that helped keep the Globe Theatre financially stable. When Evans surrendered the lease in 1608 and the King's Men took over Blackfriars, Shakespeare's plays underwent significant changes in structure and style, adapting to the indoor theatre and its more select audience.