In 1892 a prominent German bacteriologist named Richard Pfeiffer made a mistake—one that would have an enormous impact on the pandemic of 1918 and the next century of medicine.. In the late 19th ...

Haemophilus influenzae was also known as Pfeiffer’s bacillus, for Richard Pfeiffer, a researcher at the Robert Koch Institute, who had identified it as the cause of an 1889–1890 influenza ...

Pfeiffer lived his adult life in Chicago, paving the way for generations of LGBTQ people in the city and beyond. In 1970, the year after the Stonewall Uprising, Pfeiffer saw a small gay rights ...

Richard Pfeiffer watched Chicago’s first Pride Parade in 1970 from the sidelines, too shy to join in the march. By the parade’s fifth year, the local LGBTQ activist had become its lead ...

To help accelerate that foundation and synchronize contracting with field operations, Col. Richard Pfeiffer Jr., deputy director of Contracting at USACE headquarters, deployed to the wildfire ...

He was a major part of Chicago’s push for LGBTQ equality, and on Sunday, Richard Pfeiffer’s legacy was made a permanent part of the North Halsted community.