Debra Shriver, who had been appointed to the Citizens' Stamp Advisory Committee in February 2012, resigned from the panel after its October meeting, a postal spokesman told Linn’s Stamp News.

Her resignation drops the committee to 13 members, giving Postmaster General Megan Brennan the opportunity to fill two vacancies.

As vice president and chief communications officer for Hearst Corp., Shriver was described as a spokesperson for the company's magazine group, which is "the world's largest publisher for women," when former Postmaster General Patrick Donahoe named her to the panel.

More from Linns.com:

Forget-me-not chosen as the theme for missing children stamp, envelope

Special Olympics stamp marks upcoming Los Angeles Games

Penner wants U.S. stamp program to have impact

U.S. Postal Service reveals World Stamp Show stamp design

Great Britain Philately: Paying tribute to the world’s first adhesive postage stamp

Keep up with all of Linns.com's news and insights by signing up for our free eNewsletters, liking us on Facebook, and following us on Twitter. We're also on Instagram!