IMAM AL NASA’I
Aḥmad ibn Shu`ayb ibn `Alī ibn Sīnān Abū `Abd ar-Raḥmān al-Nasā'ī (214 - 303 AH, 829 - 915 CE), was born in the year 214 A.H in the famous city of Nasa, situated in Western Asia known at that time as Khurasan which was a famous centre for Islamic knowledge where many Ulama were situated and studies in hadith and fiqh was at its peak. He primarily attended the gatherings and circles of knowledge in his town where he specialized in his study of hadith. When he was 20 years old, he started traveling and made his first journey to Qutaibah. He covered the Arabian Peninsula seeking knowledge from the Ulama and Muhadditheen of Iraq, Kufa, Hijaz, Syria and Egypt. Finally he decided to settle in Egypt.
Sunan an-Nasa'i is a collection of hadith compiled by Imam Aḥmad an-Nasa'i. His collection is unanimously considered to be one of the six canonical collections of hadith (Kutub as-Sittah) of the Sunnah of the Prophet (May Allah honour Him and grant Him Peace). It contains roughly 5700 hadith (with repetitions) in 52 books.
His famous book known as Sunan al-Nasa'i which is taught around the world in every Islamic institute and which possesses a virtue of being one of the Kutub Sittah (the six books generally taught in hadith). In reality when the Imam had finished compiling Sunan Al-Kubra he presented to the governor of Ramalah so the governor asked him “Is it all sahih?” He replied in the negative, thus the governor suggested and requested that he compile another book and gather in there the Sahih Hadith. So then he did this and named his book Sunan Al-Sughra (the small Sunan) and Al-Mujtaba and Mujtana (both mean carefully chosen) and this is the Sunan which we know as Sunan An-Nasa'i. In this book he follows the footsteps of Imam Muslim and Imam al-Bukhari (R.A). Overall most of the ahadith are Sahih and where he narrates a weak narration he clearly clarifies the weakness. 
Al-Haafiz Ibn Hajar (may Allah have mercy on him) said: To sum up, the book of an-Nasaa’i contains the fewest da‘eef hadeeths and majrooh narrators among the books after the Saheehayn, An-Nukat ‘ala Kitaab Ibn as-Salaah, 1/484
There are many commentaries on an-Nasaa’i’s as-Sunan as-Sughra, among the most famous of which is the commentary of as-Suyooti which is entitled Zahr ar-Raba ‘ala’l-Mujtaba. There is also a commentary on it by Imam Muhammad ibn ‘Abd al-Haadi as-Sindi. And there is an audio commentary on as-Sunan by Shaykh ‘Abd al-Muhsin al-‘Abbaad (may Allah preserve him). One of the most comprehensive commentaries is Dhakheerat al-‘Uqbah fi Sharh al-Mujtaba by Shaykh Muhammad ibn ‘Ali ibn Aadam ibn Moosa al-Ithiyobi (may Allah preserve him), which is contemporary and has been published in forty volumes! The first five volumes of it have been published by Dar al-Mi‘raaj in Riyadh and the rest of its volumes were published by Dar Aal Baroom in Makkah al-Mukarramah; 
After the Imam had decided to stay in Egypt he started to lecture, mostly narrating ahadith to the extent that he became famous by the title Hafidhul Hadeeth. Many people would attend his gatherings and many famous Great Scholars became his students and notably the most famous ones are:
It is also narrated that Imam Tahawi personally narrated from this Imam.
  http://sunnah.com/nasai/about