class Person(models.Model):
    first_name = models.CharField(max_length=100, blank=True, default='')
    middle_name = models.CharField(max_length=100, blank=True, default='')
    last_name = models.CharField(max_length=100, blank=True, default='')
    full_name = models.CharField(max_length=255, blank=True, default='')
    degree = models.CharField(max_length=100, blank=True, default='')
    email = models.EmailField(blank=False, unique=True)

class PersonNominationProfile(models.Model):
    person = models.ForeignKey('Person', null=False, blank=False,   related_name='nomination_profile')
    person_type = models.ForeignKey('PersonType', default=None, null=True)
    status = models.ForeignKey(SpeakerStatus, related_name='status_nomination_profiles', blank=True, null=True, default=None)
    tier = models.ForeignKey('PersonTier', related_name='tier_nomination_profiles', default=None, null=True, blank=True)
    series = models.ForeignKey(Series, null=False, blank=False)
    year = models.IntegerField(null=True)

class PersonCertification(models.Model):
    nomination_profile = models.OneToOneField('PersonNominationProfile',null=False, blank=False)
    background_check_sent_date = models.DateField(auto_now_add=False,null=True)
    debarment_check_completed_date = models.DateField(auto_now_add=False,null=True)
    license_check_completed_date = models.DateField(auto_now_add=False,null=True)

all_speakers = Person.objects.filter(nomination_profile__person_type__name='Speaker')
   .values('id','nomination_profile__series_id', 'nomination_profile__series__name',
           'last_name', 'first_name', 'middle_name', 'degree', 'email'))

'nomination_profile__personcertification__background_check_sent_date'