From the Style Guide: Who/Whom

Usage of whom is becoming increasingly rare. Some say it's inappropriate for casual genre writing. However, this depends in part on the tone of the manuscript. Use the overall tone as a guide.

The test for appropriate who/whom usage is fairly simple. Whom and him both end in the letter M. Who and he do not. If you can accurately substitute the word him in the phrase or clause under question, then whom also may be used. If you can accurately substitute he, then who may be used.

Example:
The new writer, (who/whom) submitted a manuscript today, has never published before now.

The clause in question is (who/whom) submitted a manuscript.
You would not say, “him submitted a manuscript.” You would say, “he submitted a manuscript.”
Therefore, the correct choice is who. (No M.)


Example:
Are you the right person to (who/whom) I should submit my manuscript?

The clause in question is to (who/whom) I should submit my manuscript.
You would not say, “I should submit my manuscript to he.” You would say, “I should submit my manuscript to him.”
Therefore, the correct choice is whom. (With the M.)

Theresa