Siebert was an outspoken advocate for women and minorities in the industry. She was quoted as saying, "American business will find that women executives can be a strong competitive weapon against Japan and Germany and other countries that still limit their executive talent pool to the male 50 percent of their population," as well as "men at the top of industry and government should be more willing to risk sharing leadership with women and minority members who are not merely clones of their white male buddies. In these fast-changing times, we need the different viewpoints and experiences, we need the enlarged talent bank. The real risk lies in continuing to do things the way they've always been done."