How to select first row from a join that returns multple rows on the primary key This is related to this question:  Joining multiple tables results in duplicate rows

I have two tables that I am joining.  They share a key. The person table has one name per primary key but the email table has multiple emails per personId.  I want to only show the first email per person.  Presently I get multiple rows per person because they have multiple emails. I am running SQL-Server 2005.  

EDIT: This is T-SQL. 
First email is literally the first email row per person.

Edit 2:
First email as I see it would be the first email row that shows up in the join as SQL works through the query.  I does not matter which email shows up.  Only that no more than one email shows up.  I hope that makes it clearer.  

Table1: Person
Table2: Email

Select Person.PersonName, Email.Email
From person 
left join on Person.ID=Email.PersonId;
SELECT
    A.PersonName, A.Email
FROM
        (
        Select Person.PersonName, Email.Email
            ,ROW_NUMBER() OVER(PARTITION BY Person.ID ORDER BY Email.Email) AS RN
        From person 
        left join Email on Person.ID=Email.PersonId
        ) A
WHERE A.RN = 1