NZRL administration manager Carmen Taplin said Kemp had not returned to work after taking time off to coach his son's rowing team for the Maadi Cup regatta two weeks ago.
"I am worried about him and I have been trying to call him but haven't been able to reach him," she said.
She said the allegations were a shock.
"I have worked with him for years and we have been on eight tours together, staying in hotels and going to social functions, and I have seen nothing but professionalism.
"He has been amazing support for me and I am very close to him, so it is very hard to understand."
Kemp split with wife Jan last year and they sold their Coatesville home.
NZRL staff member Sash Stosic said Kemp was a good friend.
"He's always been one of the boys and men talk about their experiences and have good times, but nothing more."
Stosic said Kemp had encouraged women into the game, to promote a family-oriented culture. Kemp did not return calls yesterday.
The Human Rights Commission received 70 sexual harassment complaints in 2011 and 2012 - though it's believed that several times that many went unreported.
Last year, the Equal Employment Opportunities Commissioner at the time, Dr Judy McGregor, said it was astounding sexual harassment continued to be a problem, given the huge amount of prevention and safety material available.
"I am mindful that the numbers who come to the commission and other bodies are only the tip of the iceberg. Women who face sexual harassment at work often simply end up leaving the organisation."
An Australian Human Rights Commission report found more than one in five women experienced sexual harassment at work but only 20 per cent made a formal complaint.
Employment law specialist Blair Edwards said he had dealt with about 20 cases in the past two years.
"It is a good idea to suspend the person who is accused or at least move them to another site away from the complainant," he said.
Edwards said sexual harassment could be any unwelcome comments or conduct of a sexual nature.
