". ▁ ▁L emp el ▁founded ▁H P ▁L abs — Is rael ▁in ▁ 1 9 9 4 , ▁and ▁served ▁as ▁its ▁director ▁until ▁October ▁ 2 0 0 7 . ▁ ▁Works ▁ ▁The ▁L Z 7 7 ▁and ▁L Z 7 8 ▁algorithms ▁author ed ▁by ▁L emp el ▁and ▁Jacob ▁Z iv ▁have ▁led ▁to ▁a ▁number ▁of ▁derivative ▁works , ▁including ▁the ▁L emp el – Z iv – Wel ch ▁algorithm , ▁used ▁in ▁the ▁G IF ▁image ▁format , ▁and ▁the ▁L emp el - Z iv - Mark ov ▁chain ▁algorithm , ▁used ▁in ▁the ▁ 7 - Zip ▁and ▁x z ▁compress ors . ▁The ▁algorithms ▁have ▁also ▁been ▁used ▁as ▁originally ▁published ▁in ▁formats ▁such ▁as ▁DE FL ATE , ▁used ▁in ▁the ▁P NG ▁image ▁format . ▁ ▁Bibli ography ▁ ▁See ▁also ▁ ▁Tim eline ▁of ▁algorithms ▁ ▁Data ▁compression ▁ ▁O bl iv ious ▁transfer ▁ ▁References ▁ ▁External ▁links ▁ ▁Abraham ▁L emp el ▁– ▁G H N : ▁IE EE ▁Global ▁History ▁Network ▁▁▁ ▁Techn ion : ▁Computer ▁Science ▁Department : ▁Prof . ▁Abraham ▁L emp el ▁▁▁▁▁ ▁Category : 1 9 3 6 ▁birth s ▁Category : L iving ▁people ▁Category : Is ra eli ▁computer ▁scient ists ▁Category : Mod ern ▁crypt ograph ers ▁Category : Is ra eli ▁information ▁the or ists ▁Category : Pol ish ▁Jews ▁Category : Te chn ion ▁– ▁Israel ▁Institute ▁of ▁Technology ▁fac ulty ▁Category : J ew ish