Dangiwa Umar
Kanal (mai ritaya) Abubakar Dangiwa Umar (an haife shi a ranar 21 ga watan  Satumban shekara ta 1949) ya kasance gwamnan jihar Kaduna a Najeriya daga watan Agusta  na shekara ta  (1985) zuwa watan Yuni name shekara( 1988 ) lokacin mulkin soja na Janar Ibrahim Babangida .  Bayan ya yi ritaya daga aikin soja a shekarar( 1993 ), ya zama mai sukar zamantakewar al'umma kuma shi ne wanda ya ƙirƙiro ƙungiyar Movement for Unity and Progress, jam'iyyar siyasa.

Haihuwa da ilimi 
An haifi Umar a ranar (21) ga watan Satumban shekara ta (1949) a Birnin Kebbi, Jihar Kebbi . Mahaifinsa malamin makaranta ne kuma mai gudanarwa ne da ake yiwa binda lakabin gargajiya na Wazirin Gwandu wanda ya zama memba na Majalisar Wakilai a Legas a shekara ta (1954 zuwa1964) da Kwamishinan Ayyuka a Jihar Arewa maso zuwaa a shekara ta (1968 zuwa1975).  Ya yi karatu a Kwalejin Gwamnati, Sakkwato a shekara ta(1964 zuwa1968), Kwalejin Tsaro ta Najeriya, Kaduna a shekara ta (1967 zuwa 1972), Makarantar Ba da Makamai ta Sojojin Najeriya, Ibadan a shekara ta (1972), Makarantar Gudanar da Sojojin Amurka, Fort Benjamin Harrison, Indiana, Amurka 1976), Royal Armor School, Kentucky, USA a shekara ta (1977 zuwa1978), Command and Staff College, Jaji dashekara ta (1978 zuwa 1979 da 1982 - 1983), Jami'ar Bayero, Kano a shekara ta  (1979 zuwa 1981), Harvard University, USA a shekara ta (1988 - 1989) .

Aikin soja 
Umar ya shiga aikin sojan Najeriya a shekarar( 1967) kuma aka bashi mukamin Laftanal na biyu a watan Maris na shekara ta (1972). Ya rike mukamai daban-daban, aciki har da ADC ga Manjo Janar Hassan Usman Katsina, Mataimakin Shugaban Ma’aikata, Hedikwatar Koli.  An kuma nada Umara matsayin Babban Jami'i a Sashin Yammata, Hedikwatar Soja. A lokacin juyin mulkin ranar( 27) ga Agustan shekara ta( 1985) wanda Janar Ibrahim Babangida ya hau karagar mulki ya kasance Manjo kuma Shugaban Hukumar Kula da Gidaje ta Tarayya a shekara ta  (1984 zuwa 1985).  Ya goyi bayan juyin mulkin, kuma bayan ya yi nasara an nada shi Gwamnan jihar Kaduna. Daga baya ya samu karin girma zuwa Laftanar Kanal. 

Umar ya kasance Gwamnan Soja na Jihar Kaduna daga watan Satumban shekara ta (1985 zuwa Yunin shekarar 1988), a lokacin da kudade suka yi karanci. Dole ne ya yi fama da mummunan rikicin addini a cikin jihar a  shekara ta (1987), ya zama ba shi da farin jini ga duk bangarorin rikicin.  Ya ce "Idan kun ci nasara a yakin addini, ba za ku iya samun zaman lafiya na addini ba [. . . ] Tunda aka fara kisan kiristoci nawa ne suka musulunta? Musulmai nawa ne suka koma addinin kirista? Atisaye ne na banza ". 

A cikin shekara ta (1993 ), ya kasance Kanal kuma  Kwamandan Armored Corps Center da Makaranta. Ya kasance mai adawa da soke zaben shugaban kasa na ranar (12) ga Yunin shekara ta( 1993), kuma ya fara neman goyon baya a tsakanin sojoji don nada zababben shugaban MKO Abiola . A watan Oktoba, an tsare shi bisa zargin hadin baki, amma ba a tuhume shi ba. Bayan an sake shi ya yi murabus daga hukumar tasa.

Daga baya aiki 
Bayan ritaya, Umar ya zama Shugaba kuma Babban Daraktan, Aiki da Bauta (Kamfanin Gas) Nigeria Limited, Kaduna.  Umar ya kasance mai yawan sukar gwamnatin Janar Sani Abacha, kuma ya shiga kungiyar G-18 ta ‘yan siyasa wadanda suka fito fili suka nuna adawa da shirin Abacha na zama shugaban kasa.  A lokacin Jamhuriya ta Huɗu ta Najeriya ya kasance mai fashin baki kan batutuwa da yawa. A watan Yunin a shekara ta( 2000), ya ce batun mallakar yankin Arewacin kasar nan ya tsufa kuma bai zama dole ba.  Ya gargadi 'yan takarar da aka kayar a zaben a shekara ta (2003) da su nuna dattako da bin doka wajen daukaka sakamakon.  A watan Maris na shekarar (2004), ya rubuta wasika zuwa ga Shugaba Olusegun Obasanjo inda ya zarge shi da kasancewa mai hannu a soke zaben Shugaban kasa na (12 )ga watan Yuni a shekara ta( 1993). 

A watan Yunin 2004, ya ce manufofin tattalin arzikin da mutane ba sa so suna haifar da rikici a cikin al’umma.  A watan Mayun 2005, ya yi magana game da tilasta wa mataimakin gwamnan Babban Bankin Najeriya ritaya da tilasta gwamnati da rashin gaskiya a yakin da take yi da cin hanci da rashawa.  Ya nuna adawa sosai ga shawarwarin da aka bayar na barin Obasanjo ya sake tsayawa takara a karo na uku.  A watan Janairun 2008, ya goyi bayan cire Nuhu Ribadu daga mukaminsa na Shugaban Hukumar Yaki da Cin Hanci da Tattalin Arziki  a kan cewa Ribadu ba shi da kwarewa sosai, kuma ya aiwatar da umarnin Shugaba Olusegun Obasanjo ba tare da tambaya ba.  A watan Agustan 2009, ya zargi Shugaba Umaru 'Yar'Adua da nuna son kai a wajen nade-naden nasa.  A watan Disambar 2009, ya yi kira ga Shugaban da ke fama da rashin lafiya ya yi murabus. 

A wata hira da aka yi da shi a watan Yunin 2014, ya jaddada mahimmancin tattaunawa don magance rikicin Boko Haram, yana mai cewa:“Bana jin akwai hadin kai tsakanin mutanen soja da‘ yan Boko Haram .. Ina tsammanin dole ne a sami hadin kai na manufa; dole ne al’umma su hada kai a wannan mummunan hatsarin yaki da Boko Haram. Hanya daya tilo da kungiyar Boko Haram za ta iya cimma nasara ita ce idan al’umma suka rabu kuma ya rage ga gwamnatin tarayya ta hada kan jama’a don yaki da Boko Haram. ”

Manazarta 
 
Gwamnonin Jihar Kaduna
Sojojin Najeriya
Mukaloli marasa hujja
Haifaffun 1949