Milo Ventimiglia has been through plenty of ups and downs in his career. Following a popular stint on Gilmore Girls, then a lead role in Heroes, Ventimiglia seemed to go quiet. While he continued working, his star never seemed to rise to its previous heights. But now all that has radically changed with the role of Jack Pearson in NBC's This Is Us. Ventimiglia has experienced a kind of renaissance, and with it, much critical acclaim and an Emmy nomination for his nuanced…