Correct way to call the Model

Hi,

I have 2 Controllers and 1 Model:
[Controllers]
Employee
User

[Model]
UserModel
id
name
is_employee


An User is all the people registered in the app. An Employee is an User with is_employee == true

--//--

When i need an "simple" user, i use(inside User Controller)):

$this->userModel->getUser($id)

When i need all users:

$this->userModel->getAll()

--//--

When i need an employee i use (inside Employee Controller):

$this->userModel->select('id,name')->where('is_employee',true)->findAll()

Is this ok? is this the right way to do this?

Or i must have a method inside User to get the employee? Should Employee controller have direct access to UserModel ?

Pls, help. this is driving me insane!!!