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Two recent analyses of data collected with the ATLAS detector at the LargeHadron Collider are presented. In the first, a measurement of $b$ hadron pairproduction is presented, based on a data set corresponding to an integratedluminosity of 11.4 fb$^{-1}$ of proton-proton collisions recorded at$\sqrt{s}=8$ TeV. Events are selected in which a $b$ hadron is reconstructed ina decay channel containing a muon. Results are presented in a fiducial volumedefined by kinematic requirements on three muons based on those used in theanalysis. The fiducial cross section is measured to be $17.7 \pm 0.1({\rmstat})\pm 2.0({\rm syst.})$ nb. A number of normalized differential crosssections are also measured and compared to predictions from several eventgenerators. In the second analysis, the modification of the production of$J/\psi$, $\psi(2S)$, and $\Upsilon(nS)~(n=1,2,3)$ in $p+$Pb collisions withrespect to their production in $pp$ collisions has been studied. The $p+$Pb and$pp$ data sets correspond to integrated luminosities of 28 nb$^{-1}$ and 25pb$^{-1}$ respectively, collected at a center-of-mass energy per nucleon pairof 5.02 TeV. The quarkonium states are reconstructed in the dimuon decaychannel. The yields of $J/\psi$ and $\psi(2S)$ are separated into prompt andnon-prompt sources. The measured quarkonium differential cross sections arepresented as a function of rapidity and transverse momentum, as is the nuclearmodification factor $R_{p{\rm Pb}}$ for the $J/\psi$ and $\Upsilon(nS)$. Nosignificant modification of the $J/\psi$ production is observed, while$\Upsilon(nS)$ production is found to be suppressed at low transverse momentumin $p+$Pb collisions relative to $pp$ collisions. The production of excitedcharmonium and bottomonium states is found to be suppressed relative to that ofthe ground states in central $p+$Pb collisions.

Production of Quarkonia and Heavy Flavor States in ATLAS