Davis Guggenheim has made movies about world leaders (Barack Obama, Al Gore) and rock stars (U2, Jimmy Page, Jack White), but it's his new film about a girl and her dad that affected him most.
Of course, Malala Yousafzai is no ordinary girl.
Guggenheim spent a year and a half with the Nobel Peace Prize winner and her family to make the documentary "He Named Me Malala".
He came away deeply moved.
"She's my favourite," the Oscar-winning documentarian ("An Inconvenient Truth") said.
"You're not supposed to have favourites, but she's incredible. I've fallen in love with this family."
Even more than Malala's activism, Guggenheim was inspired by the Yousafzai family dynamic, how they value tradition, education and fun.
"I wanted my family to be more like their family," said the 51-year-old father of three.
"I wanted my family to have this joyous love for each other, this very expressive sense of love."
"He Named Me Malala" is a personal portrait of the teen activist, who was shot in the head by the Taliban in 2012 for advocating for girls' education in Pakistan.
She recovered and continued her work globally, addressing the United Nations in 2013 and winning the Nobel Peace Prize last year.
The film centres on Malala's close relationship with her father, Ziauddin Yousafzai, a teacher and public speaker who knew his daughter's gender didn't limit her potential.
"I have two daughters, and my daughters are mysterious to me," Guggenheim said. "I want to know what he did, what she did in that relationship. I want to unpack that relationship somehow."
He learned about Malala's family history of public speaking: Her grandfather was a cleric and her dad has long defended education and liberty in the face of religious extremism. The filmmaker learned about the Pashtun heroine she's is named for: Malalai of Maiwand, a brave young woman who rallied Afghani troops against the British Army in 1880 and was killed for being outspoken.
He followed Malala and her father as they travelled to Kenya, Nigeria and Jordan to support children's rights. Guggenheim also filmed Malala at home, where she does her homework, teases her brothers and blushes as she looks at pictures of Roger Federer online.
But even after hundreds of interviews and countless hours spent with the Yousafzai family, Guggenheim says 18-year-old Malala is still "a complete mystery to me."
"Clearly, she's a combination of all these wonderful things: her father's dream for her, her mother's intense spirituality," he said. "But also (it's) just who she is."
A world icon and a regular teenage girl, she's Guggenheim's favourite.
"This movie has been my favourite movie because it really has changed my life. It blows me away," he said.
"I want what they have. I want to be the father that Zia is. I want my daughters to feel the love that he gives Malala. I want them to feel that love and respect."Read More »