Tiwary, who became interested in the Epstein story 12 years ago, said: "That would overshadow that I'm trying to tell Brian's story, not the Beatles'."
He has described the manager as "a staggering success" and his life a "tremendously inspirational human story".
Brian Samuel Epstein was born in Liverpool in 1934. His father Harry's family owned a furniture store in the city.
After a spell on National Service, studying at RADA and working for the family business, Epstein, who had announced to his family he was gay, became manager of the record department at North End Music Stores (NEMS).
He first saw the Beatles in a lunchtime session at the Cavern and became their manager in January 1962.
As well as managing The Beatles, he ran a stable of acts including Cilla Black, Billy J Kramer and Gerry and the Pacemakers.
