As chief technician of Steinway & Sons from 1968 to 1992, Mohr frequently tuned pianos for numerous leading concert pianists, including Glenn Gould, Vladimir Horowitz, Sviatoslav Richter, and Artur Rubinstein.

[1] The second of three sons, Mohr's family enjoyed music; Christianity Today remarks that "Mendelssohn, Mozart, and Beethoven were as familiar as bratwurst and potatoes".

[1] While playing Dixieland jazz in dance bands, he met Elisabeth Zillikens, whom he married in 1954; together, they had two sons, Michael and Peter, and a daughter, Ellen.

[1] Issues with tendonitis in his left hand compromised Mohr's goals as a violin soloist, so he abandonded the instrument.

[1] Throughout his career, he tuned the pianos of concert pianists such as Van Cliburn, Emil Gilels, Glenn Gould, Vladimir Horowitz, Maurizio Pollini, Sviatoslav Richter, Artur Rubinstein, and Rudolf Serkin.