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This paper aims to study the impact of Chief Executive Officer's (CEO's) personality traits on open innovation (OI) strategies and the mediating effect of innovation climate by mobilizing the upper echelons theory and the OI literature. In fact, CEO's role in OI promotion has been under-investigated in the literature especially in small and medium-sized enterprises (SMEs) and in developing economies.

Based on the structural equation modeling, a survey is scheduled by administrating a questionnaire within 178 CEOs in Tunisian high-tech sector. The relevance of the empirical evidences is to disclose human levers to the success of OI strategies in the Tunisian context as a developing country.

The results show the importance of CEO's entrepreneurial orientation (EO) and attitude in promoting innovation climate and so then OI strategies. The study offers a reading grid for managers of high-tech SMEs to better lead and identify key factors for OI adoption. Innovative climate is found to be a relevant driver of OI encompassing the key role of attitude and EO of top managers.

Results highlight the relevance of the recruitment of appropriate top managers with high levels of EO and with positive attitude toward OI in order to facilitate OI integration and to enhance SMEs' competitiveness. Entrepreneurially oriented CEOs should be required in order to overcome "Not Invented Here" and "Not Shared Here" syndromes, to support innovative climate and to encourage knowledge import and export in the Tunisian SMEs.

This paper sheds light on the micro-foundation of OI by emphasizing the relevance of human factors and namely EO and attitude of CEOs in OI issue. It provides conceptual and empirical clarification of the extent to which CEO's traits affect OI through innovative climate. This would value initiatives exploring key individual's characteristics influence on OI strategies within SMEs.