Mr Dean, 36, replaced former dairy chairman Richard McIntyre and also takes his position on the national board with Richard Dawkins, 35, replacing Toby Williams to also join the national board.
Federated Farmers president Wayne Langford said the two young leaders were stepping up into significant national leadership roles.
"While they may be new to our national team, they’re by no means new to Federated Farmers. They’ve held senior leadership roles within our organisation for some time now. Karl and Richard are both highly respected and experienced farmers within their regions, and have worked their way up from the grassroots."
Mr Dean was previously the North Canterbury provincial president and vice-chairman of the national dairy council.
"It’s also been a huge honour to work with Richard McIntyre over the past seven years on the dairy council, and his 12 years of service hasn’t gone unnoticed. His leadership has helped shape a strong, positive culture, and I’m committed to carrying that legacy forward."
Mr Dawkins, who farms with his wife Jess in the Waihopai Valley near Blenheim, was elected as the organisation’s new national meat and wool chairman.
He has previously spent five years on the national meat and wool council and two years as Marlborough’s vice-president.
Mrs Green said the provincial president role had been in her sights for some time and she had just been waiting for the right moment for her family and her farming business.
"Dairy farming is my passion, but I’m really excited that as president I’ll get to broaden my horizons and come to grips with the issues in meat, wool and arable as well."
She contract milks 1000 cows with her husband Blair in Culverden and was the province’s vice-president under former president Caroline Amyes.
With a third child still a toddler, she stayed as vice-president and took on the province’s dairy chairwoman role when Mr Dean took over as president.
Mrs Green has also been elected national dairy vice-chairwoman, the position Mr Dean vacated.
She was named Federated Farmers 2024 Dairy Advocate of the Year for her leadership on issues such as streamlining a path to work in the dairy sector for immigrants.
She was ready to tackle challenges to farmers.
"Our North Canterbury sheep and beef farmers have been under huge pressure in recent years. They’ve had all those existing issues impacting the sector — and then a horrific drought on top of that. With the Federated Farmers ‘Save our Sheep’ campaign now well under way, my hope is we can bring more local sheep farmers back into the fold and really give them a voice and a platform."
With three children under 13, she still finds time for multi-sports as a former Coast to Coast competitor, winning team categories for the past two years.
