穆爾德在三個月大時被父母蘭迪·穆爾德(Randy Mulder)和珍妮弗·吉尼亞克(Jennifer Gignac)收養。他的父親蘭迪原先在通用汽車工作,後來因腿部受傷而被迫退休[1][2]。麥科爾·穆爾德的父親用前NBA球員麥科爾·湯普森的名字為他命名,麥科爾·湯普森是他未來金州勇士隊隊友克雷·湯普森的父親[3]。穆爾德在安大略省溫莎市與他的養姐辛西婭一同長大[2]。穆爾德高中就讀位於安大略省溫莎市的天主教中央高中(英语:Catholic Central High School (Windsor, Ontario)),並加入該校由皮特·庫蘇馬諾(Pete Cusumano)執教的籃球校隊[4]。在2013年,穆爾德被認為是加拿大前十名的球員[1]。
穆爾德參加了2017年NBA選秀,但未能被選中,後來穆爾德在2017年NBA G聯盟選秀(英语:2017 NBA G League draft)中被風城公牛以第九順位選中[4][7]。在公牛隊的第二個賽季,穆爾德場均出賽32.9分鐘,可得到13.7分、4.1個籃板、1.6次助攻。2019年5月,穆爾德被邀請參加NBA G聯盟精英營(NBA G League Elite Camp)[10]。
^ 1.01.1Vaught, Jamie. Despite limited playing time, Mulder becoming a productive performer for Cats. Northern Kentucky Tribune. 2017-02-14 [2019-10-02]. (原始内容于2019-10-01).
^ 2.02.1Tipton, Jerry. Beep! Beep! Mulder's father gives new meaning to dribble drive. Lexington Herald-Leader. 2016-11-13 [2020-01-01]. (原始内容于2020-11-02).
^ 3.03.1Warriors' Mychal Mulder reveals he's named after Klay Thompson's dad. RSN. 2020-03-08 [2021-09-06]. (原始内容于2021-09-06).
^ 4.04.1'A mind-blowing experience': Windsor, Ont. basketball player on Miami Heat's 'radar'. Canadian Broadcasting Corporation. 2019-09-17 [2019-10-02]. (原始内容于2020-03-09).
^Letourneau, Connor. Mychal Mulder took a long route to 10-day contract with Warriors. San Francisco Chronicle. 2020-02-27 [2020-02-28]. (原始内容于2021-01-26).
^ 7.07.1Parker, Jim. Windsor's Mulder set to workout for NBA's Clippers and Timberwolves. Windsor Star/Montreal Gazette. 2019-09-17 [2019-10-02]. (原始内容于2019-10-01).
^Roberts, Ben. Vincennes guard also considered Wichita State and Creighton. Lexington Herald-Leader. 2015-04-29 [2015-04-29]. (原始内容于2020-09-26).
^ 9.09.1Heat sign former Kentucky guard Mychal Mulder to camp deal. Sun Sentinel. 2019-09-17 [2019-10-02]. (原始内容于2021-06-30).
^Tipton, Jerry. Former Kentucky guard getting chance to boost his NBA stock at G League Elite Camp. Lexington Herald-Leader. 2019-05-11 [2019-10-02]. (原始内容于2019-05-16).
^Chiang, Anthony. Competition for Heat two-way deal grows. Miami signs Mychal Mulder to camp roster. Miami Herald. 2019-09-17 [2019-10-02]. (原始内容于2020-03-07).
^Chiang, Anthony. With both two-way contract spots still open, Heat makes moves with eye toward G League. Miami Herald. 2019-10-15 [2019-10-31]. (原始内容于2019-10-31).
^Windsor, Ont.'s Mychal Mulder won't play with Miami Heat in regular NBA season. Canadian Broadcasting Corporation. 2019-10-23 [2019-10-31]. (原始内容于2020-03-13).
^Chiang, Anthony. Heat affiliate picks Trey Mourning, son of Alonzo Mourning, in G League draft. Miami Herald. 2019-10-26 [2019-10-31]. (原始内容于2020-06-01).
^Skydorce acquire returning player rights to Mychal Mulder. G League. 2019-09-16 [2019-11-08]. (原始内容于2019-11-08).