Hi Elizabeth,
Re... "I was wondering how I might find out how I could contact Maxwell Otto Brown was who is charge (?) of Valentine Charlton's Estate for more information."
I looked through SMH, up to 1994, and I found many mentions of him, in deceased estates, notices. He was a solicitor, according to the 1980 electoral roll.
A probate notice, SMH 14.08.1976, he is a solicitor working for MICHELL, SILLAR & BROWN, 109 Pitt Street, Sydney.
A probate notice, SMH 08.10.1994, he is a solicitor working for MICHELL SILLAR, 50 Carrington Street, Sydney.
I went to the website, Find Law Australia Solicitor Search, and his name is not listed under BROWN. Maybe he has retired, because, he was a Solicitor in 1976, which was nearly 40 years ago.
Mary