High energy polarized proton experiments in USA

Great progress in high energy polarized proton experiments has been made in the USA. Historically these experiments were carried out mainly at ZGS, LAMPF, AGS, FNAL, first with polarized targets and then with polarized proton beams from 1970s. These efforts are followed now at RHIC. We will briefly review the progress of the spin physics with high energy polarized protons, especially in relation with the contribution of Prof. Alan Krisch and Dr. Aki Yokosawa who have passed away rather recently. In this spin symposium, it is meaningful to remember their achievements in the progress of the high energy spin physics. (author)