A product of Strathallan School, Walker represented Scotland at U18 and U19 levels before making his U20 debut in this year's Six Nations campaign.
The prop guided his side to a Schools Cup victory after defeating rivals Glenalmond College in the 2018 Final.
Walker's uncle is former Scotland international Sean Lineen.
The prop was named in the Scotland squad for the 2018 World Rugby U20 Championship in France.
Date of birth: 25/10/99
Place of birth: Dundee
England, Wales, France, Italy, Ireland
Wales (replacement), France (replacement), Ireland (replacement), Italy (replacement), Italy (replacement), Argentina, England (replacement), Ireland (replacement), Georgia (replacement)