A Tricky Subject-Verb Question

Brenda asks:
How do you write this sentence correctly?

Either the interviewer or the committee members usually begins by asking simple questions about your background.

When we have an "either" or "neither" introducing the subject of a sentence, we're saying that one noun or the other is the subject, but not both. If one noun is singular and the other is plural, the verb agrees with the noun that's closer to the verb:
Either the interviewer [singular] or the committee members [plural] usually begin...
Either the committee members or the interviewer usually begins...