Rajon Rondo worked with Holger Geschwindner recently.

Geschwindner is the shot doctor of Dirk Nowitzki and is an official member of the Dallas Mavericks' coaching staff.

“Holger helps everybody,” Rick Carlisle said. “He spent quite a bit of time with him before the [All-Star] break, too. I’m pretty certain that work is going to be a positive thing.

“Holger is a brilliant guy when it comes to shooting. I don’t know if there’s anybody on the whole planet I would recommend more than him.”