 Pari gbolohun ti o tẹle: Haggerty ṣe awọn akoko meji pẹlu USA Hockey National Team Development Program o si gba ami wura pẹlu Team USA ni : 2011 IIHF World U18 Championships. Àwọn ojúewé wọnyí jápọ mọ: Ṣaaju ki o to di ọjọgbọn, Haggerty lọ si Ile-ẹkọ Polytechnic Rensselaer nibi ti o ti ṣe awọn akoko mẹta 201114 ti NCAA Division I hockey pẹlu awọn RPI Engineers, ti o forukọsilẹ awọn ibi-afẹde 47, awọn iranlọwọ 37, awọn aaye 84, ati awọn iṣẹju ijiya 102 ni awọn ere 106. 