In general, do not use periods in academic degrees or professional certifications (updated 6/26/23):
PhD
MD
RN
BA
CDCES (formerly CDE; updated 7/31/20)
CKD
RD
Put all degrees and certifications after the full name and list last name only on second reference. (No Dr. Smith; just Smith.)
Abbreviations
Capitalization
Company Names
Dates and Times
Degrees and Certifications
Periods
Plurals
Spaces