Chemistry is a difficult subject, which of course causes his class not to be so easy, but he is a great guy and is always willing to help a student with their work. And he seems to love what he does. Overall, he's a great guy.
Mr Koehn or BDK as we used to call him was one of the best teachers at OHS. He always had time to help a student with Chem. He is also very easy to talk to.
One of the rare teachers that respect kids for going to school every day. Has very high standards, but will give help freely. As a person, he is freaking awesome!
He's a pretty good teacher, chem just isnt my thing. he's a really fun teacher to talk to though!
Mr. Koehn is one of the best teachers I've ever had. He's willing to go above and beyond to help you -- he's always available at school, and has helped me over