FLT WAS ASSIGNED FL270; BUT CONTINUED CLB TO FL275 BEFORE RETURNING TO FL270.

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DURING CLBOUT OF IAH ENRTE TO ORD; CLBING TO FL270; THE CAPT CONTINUED CLB TO FL275. THE CAPT WAS HAND FLYING THE ACFT. THIS PARTICULAR CAPT CLAIMS HE PREFERS NOT TO USE THE AUTOTHROTTLE OR THE AUTOPLT EXCEPT FOR SOME PORTIONS OF LEVEL FLT. HE OFTEN FLIES NOWHERE NEAR THE FLT DIRECTOR COMMAND BARS. BTWN JUGGLING RADIO COMS; MONITORING ENG PWR SETTING LIMITATIONS; AND MONITORING MODERATE FLYING SKILLS BEING DONE BY HAND; THIS PLT IS VERY CHALLENGING TO FLY WITH. HE HAS A DISTRUST AND/OR LACK OF UNDERSTANDING OF THE FMS AND PREFERS FLYING MANUALLY OR WITH INPUTS TO THE AFDS ONLY. I MADE THE STANDARD COMPANY CALL OF FL260 FOR FL270. I SHOULD HAVE ONLY CONCENTRATED ON HIS LEVELOFF; BUT I MISSED IT UNTIL APPROX FL272; WHEN I CALLED IT TO HIS ATTN IN A VIGOROUS MANNER. HIS REACTION TIME WAS A LITTLE SLOW AND BY THE TIME HE CAREFULLY STARTED THE ACFT INTO A DSCNT; HE WAS AT APPROX FL275. AT APPROX FL271; THE CTLR ASKED US OUR ALT AND I WAS AT THAT POINT HONESTLY ABLE TO SAY FL270. THE CTLR SAID WE WILL GET HIGHER SHORTLY AND LEFT IT AT THAT. I THEN HAD TO CALL OUT HIS ALT AS HE DSNDED TOWARD FL268. THIS IS MY SECOND NASA RPT FROM THE TRIP WITH THIS CAPT. AFTER THIS INCIDENT; MY LEVEL OF AWARENESS AND MONITORING WITH THIS PLT WAS SO HEIGHTENED; NO FURTHER OCCURRENCES HAPPENED.