This research investigated that do management styles have any significant effect over employee performance with HR being an intervening variable, a trend setter or culture molder in the organization and judging its impact over employee performance of Sui Southern Gas Company (SSGC) limited, which is an organization with diversified backgrounds and cultures of working people having different norms and values. Keeping the problem statement in the mind four hypotheses were proposed including autocratic and MBWA management styles. Culture has significant effect over employee performance with respect to autocratic and MBWA management styles. There is significant difference between employee perceived performance and HRIS employee performance record. The target population with sample size of 158 E-grade officer as respondents were provided questionnaire. Tests of Multiple Linear Regression (MLR) and Paired Sample T-test showed that two of proposed hypotheses were accepted and two were rejected. Hence, autocratic management styles do affect employee performance while management has to work hard to establish a good governing norms and values. This helps to mold its new management styles and culture and set new image of the organization and generate productive results.