Dianah Worman, diversity adviser for the Chartered Institute of Personnel and Development (CIPD), has been awarded an OBE for her work on equality issues in the workplace.
Worman, who has worked for the CIPD for more than 20 years, was awarded an OBE in the Queen's Birthday Honours List.
She has led a number of national equal opportunities initiatives, including campaigns against age discrimination and bullying and research on diversity, race, disability and employment.
Geoff Armstrong, director general of the CIPD, said attitudes towards diversity in the workplace had changed over recent years.
"Over the time Dianah has spent with CIPD, attitudes have changed. Prejudices and practices that were commonplace 20 years ago are now unheard of in most workplaces," he said.
"Dianah's most recent research into age discrimination has highlighted the continuing challenge for employers in rooting out the kind of practice that can disadvantage them in the jobs market and leave them short of talent and experience."