Professor Silvanus Kettleburn was a wizard who worked as a Professor of Care of Magical Creatures at Hogwarts School of Witchcraft and Wizardry. He was known to be extremely reckless by his first boss Armando Dippet though by the time of Albus Dumbledore's tenure he had settled considerably.
 Character development
Some time in his life, Silvanus was hired by Hogwarts Headmaster, Armando Dippet, to work as Professor of Care of Magical Creatures. He was known to be rather reckless and amounted 62 periods of probation for various things. The most memorable incident was when Professor Kettleburn used one of his worms in the school's production of The Fountain of Fair Fortune. The worm blew up causing fire and caught in the crossfire was fellow Professor, Herbert Beery, who taught Herbology. Professor Beery's head was severly disfigured in the incident. 
" ...it was several months before the Great Hall lost its pungent aroma of wood smoke, and even longer before Professor Beery's head reassumed its normal proportions, and Professor Kettleburn was taken off probation... "
Along the years, Silvanus lost several of his limbs are progressively became weaker. Under the reign of Headmaster Albus Dumbledore, Silvanus became less reckless.
 Prisoner of Azkaban
Professor Kettleburn was mentioned at the start of the school year in 1993 by Albus Dumbledore. He was said to be retired so he could spend some time with his remaining one and a half limbs. He was subsequently replaced by Rubeus Hagrid as the Professor for Care of Magical Creatures. 
"As to our second new appointment: well, I am sorry to tell you that Professor Kettleburn, our Care of Magical Creatures teacher, retired at the end of last year in order to enjoy more time with his remaining limbs. "
 Portrayals within films
He is not stated to be in any of the first two films although he may be one of the may unknown male Professors seen.
 Personality and skills
Professor Kettleburn was known to be very reckless, especially by his former boss, Armando Dippet. He is very skilled in the care of magical creatures due to the fact that he was hired to teach the subject at Hogwarts.