Ali Daneshkhah takes online trumpet lessons from Jeff Purtle and is from Tehran, Iran.
This one page etude was played in one breath by Ali after about one year of private lessons, having never had formal lessons prior to that. He also had never been exposed to many of the method books common to brass players in the United States of America.
It is also interesting to note that this etude from Clarke's Technical Studies is very similar to the Velocity section of the Saint-Jacome Method, found on page 177 in that book. Those etudes are slightly longer and have seventeen models listed on page 178 to be played with each etude in all twelve keys.