Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993.
concur (v.)
can combine with several prepositions: with in it means “agree with and join in on” (I concur in your decision to hire them); with on it means “agree on” (We all concur on your choice); with with it means “agree with” (Management concurs with the union on this issue). To plus an infinitive can also follow concur, as in It seemed that all our problems concurred to make life miserable.
