You can easily delare GHHP as your secondary field as soon as you have chosen a concentration; simply sign up on my.harvard. All students are welcome to join GHHP; no application is required. Once you officially declare, you'll be one of "our" students and we'll keep you informed about GHHP advising resources, courses, research opportunities, etc.
If you're a freshman or first-semseter sophomore and have not yet declared your concentration but intend to purse the GHHP Secondary Field, you can be asked to be put on our "pre-app" mailing list; this will keep you infomed about relevant GHHP events and opportunities. Please email us at firstname.lastname@example.org with your request, and include your house and year.