Who were Ayrton Senna’s race engineers?

[gold333]

Has anyone ever compiled a list?

I mean, his actual race engineer (not for example, his teammate’s).

What I know:

1984: ?
1985: Steve Hallam (?)
1986: Steve Hallam (?)
1987: Steve Hallam (?)
1988: ?
1989: ?
1990: ?
1991: ?
1992: ?
1993: Giorgio Ascanelli
1994: David Brown