About us

What is Sigma Marketplace?

Formally known as Nursing Knowledge International, Sigma Marketplace is a wholly-owned, 501(c)3 not-for-profit subsidiary of Sigma Theta Tau International Honor Society of Nursing. We are committed to providing evidence-based knowledge solutions developed for nurses by nurses. Sigma Marketplace offers free and fee-based content developed by leading organizations around the globe.

Our Mission

The mission of Sigma Marketplace is to help nurses help others. This is accomplished by providing products and services that serve the global community of nurses in its pursuit of health care knowledge, career advancement, research, and continued development of the nursing profession. Sigma Marketplace assists the nursing profession to improve the health and education of patients and the communities in which nurses practice, lead, teach, and conduct research.

Delivering on Our Mission

In addition to providing the high-quality products and services of its parent, Sigma, Sigma Marketplace has established sales, marketing, and distribution partnerships with a wide range of nursing associations, publishers, continuing education providers, and universities. These organizations produce healthcare books, continuing education, journals, research papers, teaching aids, and other forms of quality nursing-related knowledge. These products and services are made available globally via Sigma Marketplace 's website, www.sigmamarketplace.org, and through other means.


Sigma Marketplace was established as Nursing Knowledge International in November 2002 as a not-for-profit organization to serve the knowledge needs of the global nursing community. With headquarters in Indianapolis, Indiana, Nursing Knowledge International is a wholly-owned subsidiary Sigma Theta Tau International Honor Society of Nursing. The honor society has more than 135,000 active members worldwide.

Board of Directors

Liz WestcottLiz Westcott DCM, MSc, RGN
Eulalia KahwaEulalia Kahwa, PhD, RN
Kathlyn Sue HaddockKathlyn Sue Haddock, PhD, RN, FAAN
Donna M. NickitasDonna M. Nickitas, PhD, RN, NEA-BC, CNE, FNAP, FAAN
Board Secretary
 alt=Beth Ulrich, EdD, RN, FACHE, FAAN
Sandra C. BibbSandra C. Bibb, DNSC, RN, FAAN
Sigma Board Liaison
Debra HeinrichDebra Heinrich, BSN, MA, MEd
Terry SiekTerry Siek, RN, MSN, NEA-BC