Wadham was born and raised in Karori, Wellington, New Zealand. He attended Karori Normal School and Onslow College. He studied at Toi Whakaari Drama School from 2009 to 2011, graduating with a bachelor's degree in Performing Arts (Acting). He also received the Museum Art Hotel Scholarship Award in his final year of training.
Wadham started acting at a young age, and made his on-screen debut in 2000, appearing in a guest role in the sci-fi series The Tribe. After finishing his education he also went on to become a filmmaker. He wrote and directed several short films, TV shows and plays starting from 2013.
In 2009, Wadham starred as Ricky in the fantasy film Under the Mountain, which was based on the novel of the same name. In 2013, he joined the main cast of the fifth season of comedy drama Go Girls, where he played the role of Levi Hirsh. He appeared in a supporting role in the 2019 crime drama The Bad Seed.

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