Welcome to another issue of Seminars in Thrombosis and Hemostasis (STH). This is a very special issue, being the first of a series of issues we will publish to celebrate the upcoming 50th anniversary of the journal. As explained more fully in an accompanying editorial, 1 STH has been part of the thrombosis and hemostasis landscape for almost 50 years. STH was first published in 1974, and so will turn 50 in 2024. As we head toward this landmark date, we believed it is appropriate to celebrate with a series of STH issues containing content of a somewhat historical nature. The current issue of STH, the last for 2022, marks the first of these issues. We are not yet 50, but we are getting close.STH was founded by Eberhard F. Mammen (►Fig. 1). The journal started small, with only two issues and some 210 printed pages in its first year. The journal has grown over the years, and now publishes eight issues, and some 900 printed pages, per year, having also achieved a landmark of more than 1,000 printed pages in 2020.This issue contains a range of material related to the broad concepts of thrombosis and hemostasis and with a historical connection. The issue begins with two articles on fibrinogen, the major clotting protein in blood. The first, by Casini and colleagues, is a true historical piece that celebrates a 100year history of investigation into congenital fibrinogen disorders, but focusing mostly on afibrinogenemia and dysfibrinogenemia. 2 These disorders encompass a broad range of fibrinogen defects characterized by a wide molecular and clinical spectrum. From the first clinical description of afibrinogenemia in 1920, the authors describe the many major achievements that have contributed to a better understanding of these complex disorders. The finding of causative