“Aileen Rizo was training math teachers in the public schools in Fresno, Calif., when she discovered that her male colleagues with comparable jobs were being paid significantly more.

She was told there was a justifiable reason: Employees’ pay was based on their salaries at previous jobs, and she had been paid less than they had earlier in their careers.

Ms. Rizo, who is now running for the California State Assembly, sued. In April, the United States Court of Appeals for the Ninth Circuit ruled in her favor, saying that prior salary could not be used to justify a wage gap between male and female employees.

It’s the latest sign that this has become the policy of choice for shrinking the gender pay gap. Several states, cities and companies have recently banned asking about salary history. They include Massachusetts, California, New York City and Chicago, as well as Amazon, Google and Starbucks.”

Read the rest of the New York Times piece here.