However, can I suggest B&A not adopt the New York Times practice of referring to people with Mr., Ms., or Dr. at every reference? “Mr. Krug”, “Amy J. Warner PhD,” and “Dr. Warner” sound silly and makes these people seem remote, not like people I would send emails to. I think plain last names work fine.

No offense intended to Amy, who is amazing. It sounds a wee bit pretentious appending the “PhD” to each appearance of a name, or calling anyone “”Dr.” outside of grad school (where constant deference to degrees is second-nature) or the medical doctor’s office.