In 1988, together with her husband Peter Stas, she founded the watch company Frédérique Constant.

[1][2][3] The company initial strategy centered on producing classical luxury watches at an affordable price.

This strategy was the basis of strong growth during the 2007–2008 financial crisis when consumers were looking for lower prices.

[9] In 2002, as part of their effort to diversify the Frédérique Constant group, Stas and her husband acquired Alpina Watches, a manufacturer of Swiss sports watches founded in 1883.

In 2013, in collaboration with her husband Peter Stas, Gisbert L. Brunner and Alexander Linz, Stas-Bax to write the book Live your passion, Building a watch manufacture.