"And we look forward to re-reading all of them as we make our way towards what will inevitably be the very hard choice of only one of these brilliantly imaginative works as this year's victor of the Man Booker Prize".
In an interview last month, the author said making the Man Booker long list was "wonderful".
Both Robertson and Johnson are first-time novelists.
United Kingdom poet Robin Robertson's verse novel about violence and social division in contemporary America, "The Long Take", and USA novelist Richard Powers' eco-saga "The Overstory" - whose characters are both human and arboreal - are on a list that includes three United Kingdom authors, two Americans and a Canadian.
The six shortlisted authors in the running for the Man Booker Prize have been revealed, and they include the award's youngest-ever nominee.
The much-talked about graphic novel Nick Drnaso's Sabrina, unfortunately, could not make the shortlist and neither did two-time Booker victor Michael Ondaatje.
27-year-old novelist Daisy Johnson became the youngest author ever claim the Pulitzer prize - said Medusa.
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Kwame Anthony Appiah, chair of judges, said, "All of our six finalists are miracles of stylistic invention". "In each of them the language takes centre stage".
Novels need better editing and often "there is a thinner one wanting to get out", according to the jurors of this year's Man Booker prize. And yet in every other respect they are remarkably diverse, exploring a multitude of subjects ranging across space and time.
Burn's Milkman is among six novels published this year that have qualified for the final shortlist as voted for by a six person panel.
Edugyan is a Canadian author.
Every author who got to the shortlist will receive £ 2,500 and the victor will get the main prize of £ 50,000. The victor will receive a cheque for 50 thousand pounds sterling.
The Man Booker Prize for fiction was first awarded in 1969 and the victor will be announced on October 16.