H. Otto Post was working with Otto Hopf at the Rockefeller Institute in the 1930s as a glass blower. (See the
perfusion pump in Waywiser Otto Hopf manufactured.) When Hopf left to set up his own firm, Post replaced him, where he continued to do repairs on specialized glassware throughout the Institute. In the early 1950s Post established his own company to work almost exclusively on the countercurrent distribution machines he helped develop with Lyman Craig.
We learn that around the early 1970s H. O. Post was acquired by Spectrum Medical Industries Inc., 430 Middle Village Station, NY 11379. It was also Post's last address in Middle Village, NYC. This coincides with the decline of this type of machine in the field of biochemistry.