sql server 2008 query

I'm using SQL Server 2008 R2.

I have a table that looks like this:

table
Here is my fiddle for it: http://sqlfiddle.com/#!3/9ad11/2

If you look at the table. The value in the BossID column contains the EmployeeID of that employee's boss.
So if you look at my table Homer, Michael, Taylor and Erin's BossID is 2451 which pertains to the EmployeeID of value 2451 which is Montgomery Burns.  
So Montgomery Burns is Homer, Michael, Taylor and Erin's Boss.
Now if you look at the BossID value of 2356 for Montgomery Burns that pertains to EmployeeID of value 2356. So Donal Trump is Montgomery Burn's boss.

What I want is to write a query that takes in one parameter called @username.
So when I feed it the username of an employee the result set is all of the people that are his employees.
So for example if I set the parameter like this SET @UserName = 'mburns' then the result set should show all the employees which work for montgomery burns. Which in the case of my table would look like this:

result set when parameter is set to 'mburns'
if I set the parameter like this SET @UserName = 'dtrump' then the result set should show all the employees which work for donald trump. Which in the case of my table would look like this:

result set when parameter is set to dtrump

Right now I have the following query:

DECLARE @UserName varchar(50)
SET @UserName = 'mburns'

SELECT [Rid]
      ,[Lname]
      ,[Fname]
      ,[UserName]
      ,[Region]
      ,[OrderYear]
      ,[BossID]
      ,[EmployeeID]
FROM [TestR1]
WHERE [UserName] = @UserName

But that gives me this:

Here is the fiddle for my query:  http://sqlfiddle.com/#!3//3

result set of my query

Any idea of how I need to revise my query?
LVL 1
maqskywalkerAsked:
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Richard ObenchainCommented:
DECLARE @UserName varchar(50)
 SET @UserName = 'mburns'

SELECT t1.[Rid]
       ,t1.[Lname]
       ,t1.[Fname]
       ,t1.[UserName]
       ,t1.[Region]
       ,t1.[OrderYear]
       ,t1.[BossID]
       ,t1.[EmployeeID]
 FROM [TestR1] t1 join TestR1 t2 on t1.bossid = t2.employeeid
 WHERE t2.[UserName] = @UserName
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Microsoft SQL Server 2008

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