▁mess aging ▁systems , ▁and ▁led ▁to ▁the ▁development ▁of ▁XML ▁( e X t ens ible ▁Mark up ▁Language ) ▁developed ▁by ▁a ▁working ▁group ▁at ▁the ▁W 3 C ▁ ▁( World ▁W ide ▁Web ▁Cons ort ium ). ▁Ferr is ▁then ▁became ▁chair ▁of ▁web ▁service ▁architecture ▁working ▁group ▁at ▁the ▁W 3 C . ▁ ▁In ▁fall ▁ 2 0 0 2 , ▁Ferr is ▁joined ▁IBM , ▁and ▁later ▁became ▁an ▁IBM ▁Dist ingu ished ▁Engine er . ▁ ▁Ferr is ▁has ▁also ▁provided ▁technical ▁o vers ight ▁and ▁leadership ▁in ▁Open Stack , ▁Cloud ▁Found ry , ▁Cloud ▁Native ▁Comput e ▁Foundation , ▁Open ▁Container ▁In iti ative , ▁Mes os , ▁Docker ., ▁ ▁Linux ▁Foundation ▁Hyper led ger ▁ ▁Ferr is ▁is ▁a ▁member ▁of ▁the ▁Hyper led ger ▁Techn ical ▁Ste ering ▁Committee . ▁He ▁is ▁an ▁advoc ate ▁for ▁open ▁source ▁code ▁communities ▁with ▁commer cially - friend ly ▁lic enses , ▁and ▁open ▁govern ance , ▁such ▁as ▁Linux ▁Foundation ▁Hyper led ger . ▁ ▁Ferr is ▁was ▁the ▁ke yn ote ▁speaker ▁on ▁the ▁" State ▁of ▁Block chain ", ▁at ▁the ▁ 2 0 1 7 ▁Open ▁Source ▁Le ad ership ▁Sum mit ▁ ▁for ▁the ▁Linux ▁Foundation . ▁ ▁Publications ▁ ▁And rou la ki ▁E , ▁Bar ger ▁A , ▁B ort nik ov ▁V , ▁C ach in ▁C , ▁Christ id is ▁K , ▁De ▁Car o ▁A , ▁En ye art ▁D , ▁Ferr is