A multi millionaire Sydney businessman, who heads up a financial company with thousands of clients, has revealed his new identity - as a woman named Savannah Jackson.

Daniel Kertcher, appeared on Channel Seven's Sunday Night, sharing the story of his life and transformation to Savannah a few weeks ago.

Mr Kertcher was an army officer, bodybuilder and built a financial advisory firm Trading Pursuits with his wife Julie Cairns, who he met one night at a Sydney bar while dressed as Savannah.

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Mr Kertcher pictured outside a business conference in one of his many webinars for finance clients

Ms Cairns supported Mr Kertcher dressing as Savannah from the beginning of their relationship.

'When we first got together, Savannah did explore the idea of going on hormones, and potentially transitioning,' Ms Cairns said.

She said she told Mr Kertcher at the time they couldn't take that journey as a couple, because she is a heterosexual woman.

The pair split up after five years together when Mr Kertcher decided to undergo gender reassignment surgery, but remain friends and business partners.

Mr Kertcher travelled to Thailand in 2014 with his mother Sharon to undergo the surgery, to remove his male genitals and have them reconstructed as female genitalia.

He told Sunday Night he had spent much of his life wrestling with the idea of being a woman and denying it.

Mr Kertcher dressed as Savannah before he underwent the gender reassignment surgery in Thailand

He said when he finally accepted it, his family and close friends were supportive but he was concerned about the reaction of his staff and clients.

The couple spent years in consultation with psychologists before introducing Savannah to their daughter when she was eight years old.

Ms Cairns, who was supportive throughout the entire process, said she wanted Ms Jackson 'to live her biggest, fullest life'.

Mr Kertcher dressed as Savannah (left) with his former wife Julie Cairns (left)

Ms Jackson said although her marriage had ended, she never lost Ms Cairns as a friend, or her business partner.

'Throughout all of this we were together,' she said.

'I’m never been in prison or anything but I can imagine it's like being an innocent person incarcerated but living in this prison and now being released.'

Julie Cairns (left) and Daniel Kertcher (right) pictured together on their wedding day

'I can just be myself and that to me has been the greatest single gift I have given myself - is the freedom to be myself.'

Over the next 12 months Ms Jackson will need another four surgeries to complete her transition into a woman, including facial and body sculpting.

Mr Kertcher's former wife, Julie Cairns, speaks about the adventure, how they have an 11 year-old daughter and that she lives in an adjoining flat next door to Savannah

Mr Kertcher in a video message to his clients that he is transgender and will soon transition into a woman

Ms Cairns (left) and Ms Jackson (right) have an 11 year-old daughter who was gradually introduced to Savannah when she was eight years old

Throughout the entire process Ms Cairns was supportive of Ms Jackson's wishes, even helping her clear the men's clothes from her cupboard in their adjoining flat

Ms Jackson told Sunday Night that transitioning into Savannah has been 'the greatest single gift she could have given herself'

Savannah Jackson pictured at a Sydney hair salon getting hair extensions on the day of her rebirth

The Twitter reactions to Sunday Night's story were overwhelmingly positive, with this viewer describing Savannah as 'beautiful and courageous'

Another tweet referred to it as an 'amazing transgender story'

Twitter users also wished Savannah luck in her full transition into a woman

The tweets also referenced Savannah's wife, commending her for patience and understanding in the process

Ms Jackson tries on a range of new clothes on the day of her rebirth