Here's how you can do this in HubSpot.
1. Create company record
2. Find and add the contact from LinkedIn.
3. Connect with your key contacts on LinkedIn.
4. Use the field (Workforce Development Type) on the contact record.
5. Your marketing list will auto-populate new contacts that are marked as HR or HR Directors.
6. Create a marketing email and landing page. Add an event registration button if you want to invite this audience to an event.
OR... if you have a list of HR directors in excel, simply import them into HubSpot.