Graeme-Evans is the daughter of a novelist, Eleanor, and an RAF pilot. As a child, she travelled with her parents, to Egypt during the Suez Crisis and spent three years in 1960s Cyprus during Turkish-Greek Cypriot conflicts. She was educated at many schools including The Fahan School in Hobart, Tasmania, and the Wilderness School in Adelaide, South Australia. Whilst at Wilderness, Posie topped the State in South Australia in Ancient History in the Leaving Certificate. She married her first husband, Tim Jacobs, and had her first daughter while at university.

Her first job, at age 25, was with New Zealand TV props department and she went on to work at the Tasmanian Film Corporation as assistant editor and then editor. Credits there include assistant editor (sound and picture) on Manganinie and Fatty and George, plus editing a number of documentaries. Work at the ABC followed including directing on 1982 Commonwealth Games, directing football and basketball and, also, field and gallery director for "Nationwide", the forerunner of the 7.30 report. Selected to be part of a course run by Alan Bateman to identify the ABC's next generation of Executive Producers - one of eight of the hundreds who applied nationally - she topped the course. Fellow attendees included Kris Noble, later Director of Drama, Nine Network and EP of Big Brother; Graham Thorburn, currently Head of Film and Television, Australian Film, Television and Radio School; Helena Harris, who, with Posie, later co-created Hi-5 and Ric Pellizari, long-time producer of Blue Heelers in its glory days and later, EP of Neighbours. (1977). In 1983, Graeme-Evans was in Sydney directing episodes of ABC-TV music drama series Sweet and Sour (1984).

"I was the worst of the five directors... I was over-confident and I thought I had the material under control. I didn't... it was our first Christmas here; we had no friends, no family and I was distraught." Posie later went on to produce "Sons and Daughters" for Grundy, and "Raffertys Rules" for the Seven Network.

Graeme-Evans' first marriage ended about a year later; five years after her divorce she married her second husband Andrew Blaxland and founded her production company Millennium Pictures.

Graeme-Evans established herself as an editor, director, and producer in the Australian film and television industry, achieving success as co-creator of the children's series The Miraculous Mellops (1991-2), Mirror, Mirror (1995), and Hi-5 (1998-present). In 1997, she produced Doom Runners, a made-for-TV film about a group of children in a post-apocalpytic Earth trying to reach the last unpolluted place on Earth, New Eden. She is also creator and executive producer of the Australian drama series McLeod's Daughters (2001-9), having produced the show in its early years (including the TV movie starring Jack Thompson as Jack McLeod, the highest rating Australian TV movie of all time). Her husband, Andrew Blaxland, also works on McLeod's Daughters as Executive in Charge of Production. Posie has also co-written two best selling CDs of "Songs from the Series" of McLeods Daughters with composer and long-time collaborator, Chris Harriott (just nominated for his 6th Aria for his other passion, Hi-5).

Posie was Director of Drama for the Nine Network between December 2002 and November 2005 and resigned to take up a new multi-book international deal from her publishers, Simon and Schuster in New York. Her time at the Network is a landmark chapter in Gerald Stone's new book Who Killed Channel Nine?. The book goes more than some way towards setting the record straight about the recent decline of the once stellar network.

Graeme-Evans and Andrew Blaxland live in Sydney. They have two daughters, both named Emma, and a son Julian.

Graeme-Evans has also written a trilogy of popular novels set in medieval England featuring a fictionalised account of Anne, mistress of Edward IV of England. The novels are:

• The Innocent (2002), ISBN 0-7318-1120-8 Review
• The Exiled (2003), ISBN 0-7318-1121-6
• The Beloved (2005), ISBN 0-7318-1122-4 (published in the U.S. as The Uncrowned Queen)

She is currently engaged on writing two new Novels, "Holy Ground", formerly "Freya Dane" and "The Carfax Bequest". Publication is expected towards the end of 2008.