MS SQL query to show nearest date

SELECT  * FROM    
(Select ROLES.[USERID], ROLES.[ROLE], ROW_NUMBER() OVER(PARTITION BY ROLES.[USERID] ORDER BY Activity.[SIGNON_TIME_STAMP] Desc) RN From [Database].[Schema1].[table1] ROLES
LEFT JOIN [Database].[Schema2].[table1] Activity on ROLES.[USERID] = Activity.[SIGNON_USERID]
WHERE RN=1 Order by ROLES.USERID)D

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If you only need the one date column from that activity table then using group by and max() should be fine. ROW_NUMBER() OVER() is my usual goto solution for this because it gives you access to complete rows of data unaffected by aggregate functions.

Here however I'm not sure why you are using a LEFT JOIN, perhaps to list users who have never logged on?
If you really need that to be effective you must table care the where clause does not inhibit rows without a join from the result.

Below I have used row_number() prior to the join and it allows the result to return unjoined users.

SELECT
      ROLES.[USERID]
    , ROLES.[ROLE]
    , Activity.[SIGNON_TIME_STAMP]
FROM [Database].[Schema1].[table1] ROLES
LEFT JOIN (
      SELECT
            [SIGNON_USERID]
          , [SIGNON_TIME_STAMP]
          , ROW_NUMBER() OVER (PARTITION BY [SIGNON_USERID] ORDER BY [SIGNON_TIME_STAMP] DESC) RN
      FROM [Database].[Schema2].[table1]
      ) Activity ON ROLES.[USERID] = Activity.[SIGNON_USERID]
                 AND Activity.[RN] = 1
ORDER BY ROLES.USERID
;

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Naitik Gamit and PortletPaul - Your guys solutions are what I'm after. Thanks! Mike - I couldnt get yours to work.
And to answer PortletPaul, yes I also want to see users who have not logged in -reason for the Join.

So now I need to either create a view from this select and grant to a user or create a table from this select and grant to a user.
I suspect if I create a table, I'd have to set it up as a job, to drop table, recreate table and give grant possibly nightly...
Can I set this up as a view? Or would that still only give me the info as of the time the view was created?
User (granted user) wants to be able to come to this view/table any day and see who has what roles and the last time they have logged in.
How best to handle?

Thank you!