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هيثم مزاحم هو باحث ومحلّل سياسي لبناني متخصص في شؤون الشرق الأوسط والإسلاميات. وهو مساهم منتظم في صحيفة الحياة، وصحيفة البلد، وموقع اتلانتيك بوست الأميركي، فضلاً عن المجلات السياسية والأكاديمية العربية. وقد نشر مزاحم كتابين هما: حزب العمل الإسرائيلي( 1968-1999" (العربية) عام 2001، والصراع على الشرق الأوسط (2013)، وله كتابان تحت الطبع بعنوان "تطور المرجعية الشيعية: من الغيبة إلى ولاية الفقيه"، و"كيف تحدث الثورات؟". وقد ساهم في ستة كتب أخرى، اثنين عن التيارات السياسية والفكرية في إيران (2011)، وكتاب بعنوان: "ثورات قلقة" (2012)، وكتاب عن "إيران والإخوان المسلمين" (2013)، وكتاب السلفية المتحوّرة(2013)، وكتاب "الجهاديون في مصر"(2014).
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