User: <%= @user_certification.user.name %>

Certification: <%= @user_certification.certification.name %>

Created: by <%= link_to @created_by.name, @created_by unless @created_by.blank? %> at <%= @user_certification.created_at %>

Updated: by <%= link_to @updated_by.name, @updated_by unless @updated_by.blank? %> at <%= @user_certification.updated_at %>