Coach Nall's coaching career began at San Antonio's John Jay High School in the 2004 season; filling the position of assistant Swimming, Diving, and Water Polo.

The following year, Coach Nall took the head Swimming, Diving, and Water Polo position at Jay's rival high school, Oliver Wendall Holmes High School; leading the Huskies to their first water polo playoff appearance in 12 seasons. In his second year at Holmes, the Huskies had their first playoff win in 15 seasons.

The Holmes Huskies also advanced swimmers to regionals in both years, which had not been achieved in the prior 7 seasons.

In the 2009 season, Coach Nall returned to his old high school, Smithson Valley High School, to coach the same position for an already-developed swim team, and to begin a new water polo program. Swimming continued its success at the regional level, and water polo made the 5A regional playoffs despite 2009 being the first year of the program's existence. The additional fact that the training facility was outdoors and off campus (and 30 miles away) made the team's achievements all the more impressive.

In 2010, Coach Nall and his family relocated to the Houston area; and saw Coach Nall accept the head swimming job at New Caney High School. At the end of that season, New Caney, at its building's capacity as a class 5A school, divided into Porter High School.

Porter's program has seen growth by leaps and bounds since the split. Porter's team has gone from 13 active swimmers to an active roster of 34. With a brand new record board on the wall, each year brings a flurry of entertaining swims and overall excellence.