Sometime between 1190 and 1198, Mika founded a Benedictine monastery in Telki in Pilis County, dedicated to the first Hungarian king Saint Stephen I. As possessor of the right of patronage, Mika sold three estates of the monastery to the Provostry of Székesfehérvár, according to a letter of Pope Innocent III in 1215–1216. Mika petitioned to the Roman Curia in 1224; according to his complaint to Pope Honorius III, there were hardly any monks left in the monastery to worship because of the general indiscipline. Mika unsuccessfully requested the pope to transfer the monastery under the supervision of the Cistercians of Heiligenkreuz Abbey. However, the Telki Abbey remained in the hands of the Benedictine friars.
Mika was a confidant of King Andrew II. Along with other noblemen, he participated in the Hungarian military campaign against the Principality of Halych in the summer of 1211, when Andrew II intended to restore the child Danylo Romanovich to the Galician throne upon the request of a group of boyars. The Galician–Volhynian Chronicle refers to him with the epithet "the Bearded" (Barbatus or Borodaty). Mika was wounded in the skirmish against the Cumans, who supported the aspirations of Vladimir Igorevich. The Galician–Volhynian Chronicle incorrectly claims that a Cuman chieftain Tobaša cut off his head.
Returning to Hungary, Mika was made ispán of Bihar County in 1212. He held the dignity until 1216, when he was replaced by a certain Neuka. The Regestrum Varadinense preserved much details of his activity as ispán. His deputies (curialis comes) were Sicula, Nuethlen, Paul and Demetrius in the period between 1213 and 1215. Mika served as ispán of Bihar County for the second time from 1219 to 1221. The name of his two commissioners are preserved, Kölked and Farkas. King Andrew II commissioned Mika, endowing him with special licenses, to judge over legal cases involving the privileged group of royal servants in 1220. According to a charter from that year, the "fellows of Bihar County" (i.e. royal servants) sought justice in a matter of theft from Mika, "the judge dispatched by King Andrew". The royal servants of Békés and Kolozs counties turned to Mika's special judicial court too. Upon the king's order, Mika also judged over lawsuits concerning royal servants in Zala and Somogy counties, in the opposite part of the Kingdom of Hungary. These data prove that Mika's jurisdiction regarding the legal cases of the royal servants geographically covered the entire territory of the realm, after Andrew II delegated this function specifically to him. Mika was styled as ispán of Nyitra County in 1223. He again administered Bihar County in 1226.
After Andrew's eldest son and rival, Béla IV ascended the Hungarian throne in 1235, Mika fell out of the favor of the royal and completely lost political influence. Along with other courtiers, such as Nicholas Szák and the former treasurer Nicholas, Mika was convicted of "high treason", while other barons of the late Andrew were executed or imprisoned. According to a letter of Béla IV to Pope Gregory IX around August 1236, Mika had usurped much of the crown revenues and deposited it with local churches (possibly in Bihar County). The Hungarian king confiscated the estate Jenő from him and handed over it to his confidant Paul Geregye prior to 1236. The fate of Mika is unknown.