After spending several years teaching weaving and promoting Swedish textiles in Boston, Massachusetts, at the beginning of the 20th century, she returned to Sweden in 1909 where together with Emy Fick she established the Birgittaskolan in Stockholm.

In addition to providing courses, the Birgitta School served as a leading textile studio producing decorative works, tapestries and rugs.

Working with children's clothing in Stockholm's Nordiska Kompaniet department store, she met Emy Fick.

Offering courses in sewing, embroidery and lace, the firm also satisfied orders for underwear, decorative textiles and rugs.

In 1917, Glantzberg moved into fashion, employing two designers to follow Parisian trends creating remarkably daring collections.