LEARJET 35 CPR CAPT MISTOOK HEADING CHANGE FOR ALT AND DSNDED FROM ASSIGNED ALT.

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CAPT INITIATED A DSCNT OUT OF FL310 TO FL250. ACFT WAS INSTRUCTED TO TURN TO 250 DEGS. FO CHANGED HEADING BUG TO 250 DEGS AND VERBALIZED '250' IN COCKPIT. FO CONTINUED DUTIES OF PUTTING APCH PLATES IN ORDER. CAPT DID NOT DO STANDARD BEHAVIOR -- HE CHANGED THE ALT PRESELECT; HE DID NOT ACKNOWLEDGE THE CHANGE IN PRESELECT. HE WASN'T WEARING A HEADSET. ACFT WAS NOT EQUIPPED WITH INTERCOM. THIS WAS MY FIRST AND LAST TRIP WITH THIS COMPANY. I FOUND SERIOUS DEFICIENCIES WITH THEIR FLT DEPT. NO SOPS. NO RESPECT FOR ACFT LIMITATIONS; IE; OVER-BOOST N1; DURING TKOF ROLL. CAPT WOULD FIREWALL THROTTLES ON TKOF. CAPT DID NOT WEAR HEADSETS; EVEN THOUGH IT WAS APPARENT TO ME HE HAD DIFFICULTIES HEARING. I GUESS HIS AGE ABOUT 58-63 OLD. CAPT HAD DIFFICULTY MANAGING A 2-PERSON CREW. RESPONSIBILITIES WERE BLURRED; NO CLR DIRECTION. HE WOULD NOT DELEGATE DUTIES. LONG DUTY DAY; ENDING IN AN AREA OF SEVERE TSTMS (LEVEL 4-6). DUTY DAY EXCEEDED 14 HRS; DUE TO COMPANY GREED AND LACK OF PROFESSIONALS IN THE DISPATCH DEPT. CREW WAS NOTIFIED BY ATC OF THE IMPROPER ALT. NEXT CTLR GAVE US A PHONE NUMBER TO CALL. WE WERE TOLD OF THE ALTDEV RPT TO BE FILED.