He was top the ten finalist for Guitar Player magazine’s Guitar Superstar of the Year in 2008 and has worked with musicians like Zakk Wylde and Bumblefoot.
With friend's Gash, label mates Tuuli and even a planned tour with (the then unknown in the UK but friends with the band) Bumblefoot.
They recorded a 4 song EP entitled "Monuments" that was mastered by current Guns and Roses guitarist Bumblefoot.
Next to recording and touring with Bumblefoot, Leeflang has been recording drums for numerous albums since 2004, both from his own studio and at various studios in the New York area and in Europe for many known and up-and-coming artists, including Anneke van Giersbergen, Milan Polak, Indestructible Noise Command, Tiffany Giardina, Ted Poley (Danger Danger), Shane Gibson (Korn) and Angus Clark (Trans-Siberian Orchestra).
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Throughout 2011, Dennis has released one song a month with Bumblefoot of which several were renditions of classic songs such as The Beatles' Strawberry Fields Forever, as well as original songs which Thal and Leeflang co-wrote at Leeflang's studio in 2009, just before embarking on the Lita Ford tour together.