There are several hundred thousand estimated family and local historians in Australia and maybe 2 to 3 times that number with a casual interest in the subject. That's information from Unlock the Past. The survey results are based on the votes of 63 people who gave their residence as Australia or New Zealand.
There was a tie for the person with the most votes, 30 votes each:
1. Judy Webster, Grad.Dip. Local and Applied History, is an accredited researcher with many years of experience in genealogy / family history research, especially at Queensland State Archives.
Judy Webster's Genealogy Advice website is crammed with content, especially for those researching in Queensland. It includes a name index to various sources at Queensland State Archives.
Judy is perhaps best known on the larger stage for developing the Genealogists for Families project, which makes $25 loans that enable borrowers without access to traditional banks to expand their businesses, support their families, save for the future and raise themselves out of poverty. The project received the 2011 GeneaBlog Award for Best New Community Project having gained more than 135 members in 9 countries helping over 290 individuals or groups.
British GENES (GEnealogy News and EventS) blog and teaching online Scottish courses through Pharos Teaching and Tutoring Ltd.
Others who gained at least half as many votes as the winners were:
4. Heather Garnsey (22)
5. Kerry Farmer (20)
5. Martyn Killion (20)
7. Nick Barratt (19)
8. Dan Lynch (16)
8. Dick Eastman (16)
10. Michael Gandy (17)
11.Thomas MacEntee (15)
New Zealand's Jan Gow, recently awarded the Queen’s Service Medal "For services to genealogical research," attracted 10 votes, especially notable considering the ratio of population between Australia and New Zealand.
Remember that 63 is a small sample. Three votes separate 5th and 10th rank so don't place much emphasis on the rankings.