Andrew Nielsen was drafted by the Leafs last year 65th overall and has just finished his season with the Lethbridge Hurricanes of the WHL. He is listed at 6'3" and 207 lbs.
He ended up 8th in primary points in the WHL amongst defencemen with 18 goals and 18 assists, good for 11th in primary poinst per game played for defencemen.
For more detail, check out this statistical look at him or Scott Wheeler's most recent review of the top 25 under 25, where he had this assessment:
Despite an excellent (surprisingly so) season from Andrew Nielsen, he remained unranked.