Sydney professor Feng Chongyi has arrived back in Australia after being detained in China for a week and interrogated by authorities.
The academic from the University of Technology Sydney (UTS) was held and questioned after a three-week research trip in southern China.
Dr Feng boarded a flight in the southern city of Guangzhou on Saturday night and arrived in Sydney this morning.
Dr Feng's daughter Yunsi, who had appealed for her father's speedy return from China, said she had been reunited with him, in a post on Twitter.
He said he was concerned about what might happen to his lawyers in China.
"The only worry now is that they may punish those lawyers," Dr Feng said.
"I did not do anything illegal, and the lawyers only performed their duty."
Dr Feng said he was not told why he was permitted to leave the country.
As a condition of his departure, he said he was made to sign a statement agreeing not to give details of his questioning or where it had taken place.
In a short video message to supporters recorded shortly before Dr Feng left China, the Australian permanent resident described his ordeal as "one of life's little accidents".
Dr Feng has previously criticised Beijing's growing influence in Australia, particularly within Australia's Chinese-language media, and its crackdown on dissenters in China.
Since arriving in China a month ago, Dr Feng had met with fellow academics, intellectuals and human rights lawyers in several cities.
Dr Feng's case sparked concern among international academics and prompted Australian government intervention.
UTS said it was pleased the matter had been resolved, and its focus had always been on Dr Feng's wellbeing and family.