How does expertise of a geophsysist matter when it comes to biological evolution?
As for that biology teacher.. let us look at the place he teaches.
From the 'about us' section of the college he teaches at
HISTORY: Associated with the Christian Reformed Church, Dordt College was founded in 1955 and today welcomes all students who are interested in a biblical, Christ-centered education.
and from their 'our philosphy' section
The Dordt College community confesses that the Scriptures are the Word of God. As God’s infallibly and authoritatively inspired revelation, the Bible reveals the way of salvation in Jesus Christ, requires a life of obedience to the Lord, and provides the key to understanding, interpreting, and finding purpose in life.
So, you have one scientist who is making comments about an area of study that is not his field, and the other one is a teacher in a college that proclaims that the bible is the infallible word of god.
Is that the best you can do? An appeal to authority for one, and the other one has an obvious religius axe to grind.