At Mamamia, we want to acknowledge and celebrate the Australian men who are doing good things and trying to make our country a better place. So we came to you with a list of 100 great Aussie men and asked you to decide Mamamia’s 50 Best Blokes. This week, we’ll be counting down the top ten and announcing who you chose as Mamamia’s Best Bloke on Friday. And coming in at number three is Aussie legend Samuel Johnson.

When actor Samuel Johnson announced his retirement earlier this year to focus his efforts entirely on charity work, his sister Connie publicly rebuked him for failing to consult her first.

Sounds harsh? Not if you consider the incredibly close bond between the siblings.

Best known for his roles in the Logie Award winning TV drama,The Secret Life of Us, and the mini series Molly, Johnson became firmly wedged in Australian's hearts when he embarked on a world record ride on a unicyle to raise money for cancer research and to show support for his sister who was diagnosed with terminal breast cancer when she was 33.

In the end he set the Guinness World Record for unicycling, with a year-long effort in 2013 that covered 16,000kms.

The 28-year-old and his Canberra based sister Connie have raised more than $2.3 million for cancer research through their charity organisation Love Your Sister,

Most recently, he added LGBT rights to his list of public concerns. In order to celebrate Love Your Sister's dedicated following of 350,000 Facebook fans, Johnson decided to get personal.