function Get-SidFromUsername {
<#
.SYNOPSIS
    Returns a domain or local user's SID based on username
#>

    [CmdletBinding()]
    Param(
        [Parameter(Mandatory=$true)]
        [Alias("User")]
        [string]$userName,

        [Parameter(Mandatory=$false)]
        [Alias("Domain")]
        [string]$domainName
    )

    $logLead  = (Get-LogLeadName);

    if ([String]::IsNullOrEmpty($domainName))
    {
        Write-Verbose ("$logLead : Looking for local user account {0}" -f $userName)
        $objUser = New-Object System.Security.Principal.NTAccount($userName)
    }
    else
    {
        Write-Verbose ("$logLead : Looking for domain user account {0} in domain {1}" -f $userName, $domainName)
        $objUser = New-Object System.Security.Principal.NTAccount($domainName, $userName)
    }

    Write-Verbose "$logLead : Translating user to SecurityIdentifier"
    $strSID = $objUser.Translate([System.Security.Principal.SecurityIdentifier])
    return $strSID.Value
}