Portrait of Katherine Johnson, mathematician whose calculations of orbital mechanics as a NASA employee were critical to the success of the first and subsequent U.S. crewed spaceflights. During her 33-year career at NASA and its predecessor, she earned a reputation for mastering complex manual calculations and helped pioneer the use of computers to perform the tasks. The space agency noted her „historical role as one of the first African-American women to work as a NASA scientist“. Her portrait is part of my long-term project 100 Women.