He's been photographing Prince Harry and Markle for over a year now, so we asked him what his favourite photograph of the couple is so far - and his answer is one that's surprisingly recent.
"Having photographed Prince Harry for so many years as a solo royal, it's been great to capture him with the duchess, two people who clearly share similar passions and are so relaxed and happy together," Jackson told INSIDER. "I actually took my favourite photograph of the pair during a visit to Sussex yesterday - a lovely interaction as they held hands and burst into laughter during a visit to a youth project."
"The Duchess of Sussex has really introduced an exciting new dynamic to the royal family," Jackson said. "Right from her first official appearance at the Invictus Games in Toronto, she has been relaxed and natural on camera."
He also thinks her demeanour has come across as "relaxed and unforced" since becoming a royal and she carries a sense of "confidence" during her high-profile appearances.
"She takes the time to chat to as many people as possible on royal engagements, and it's certainly been exciting for me as a royal photographer to document this exciting time!" Jackson said.
He especially loves the photos he takes that "remind you these are brother and sister, mother and son, sister and brother."
For instance, he named the moment Markle and Camilla, Duchess of Cornwall, burst into laughter during Prince Harry's speech for the Prince of Wales' 70th Birthday Patronage Celebration in May as one of his favourite moments he's captured.
Several more of Jackson's favourite moments have been collected in his new book, "Modern Monarchy," which will be released later this month.
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