models.py

class Profile(models.Model):
    """Extend User model """
    company = fields.CompanyField()
    user = models.OneToOneField(to=User, on_delete=models.CASCADE)
    timezone = fields.TimeZoneField(default=settings.DEFAULT_PROFILE_TIMEZONE)
    created = models.DateTimeField(auto_now_add=True, editable=False)
    last_updated = models.DateTimeField(auto_now=True, editable=False)

    class Meta:
        ordering = ('-created',)

    def __str__(self):
        return 'Profile of %s' % self.user.username


def create_user_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)


models.signals.post_save.connect(create_user_profile, sender=User)