Who helped Michael Jackson write Esperanto?

Few people know this, but Esperanto has probably never enjoyed more airtime than on June 14 1995, when 60 million people watched Diane Sawyer’s live interview of Michael Jackson and his wife Lisa Marie Presley on American TV (ABC) – and were shown Jackson’s controversial promo/short film "HIStory", which included actors speaking the following lines in Esperanto:

Diversaj nacioj de la mondo
konstruas ĉi tiun skulptaĵon en la nomo de
tutmonda patrineco kaj amo kaj la kuraca forto de muziko

Venu ĉi tien!

The film itself has been thoroughly analysed (with myself once taking part in a discussion), but one question remains unanswered:

Who helped Michael Jackson with the Esperanto part of the script?

(I would not be surprised if the idea was his, but I would be surprised if he had spent time learning the language, so I guess somebody in his team must have had an Esperanto connection somewhere, somehow… It would be interesting to know the story!)