Taqlid

According to majority of our Shia Ulama, the most learned Mujahid and Marja' of Taqleed is Ayatullah Sistani. There are many other big Mujtahids but he is been accepted by majority of Ahl Al-Khubra (Experts scholars) in the Hawza as the most learned Mujtahid.

'Wassalam.

You need to follow the witness of two of more of Ahlul Khubra أهل الخبرة 

Ahlul Khubra are the high standard of Ulama in the Hawza who know the level of knowledge of the Mujtahids and define who is the most knowledgeable among them.

'Wassalam.

Taqleed is based on the logical necessity for the non expert to refer to the expert.

This is followed in every field of knowledge in life. All human beings practically follow this fact in every matter. Religious day to day rules are not an exception. Non experts in religious studies need to follow the experts. We believe that every religious act must be based on real evidence. Evidence is known to the experts who spend long time in studying and researching the Islamic sources ( Quran, Hadeeth, Aql and Ejmaa'). People must refer in religious matters to the most learned Islamic scholar who is called al-'Alam.

From the time of the Prophet (SAWA) and the Ifallible Imams, Muslims who lived in places far away from them, were ordered to refer in religious matters to the scholar in their area. 
Taqleed is obligatory on non experts in religious studies (non Mujahid or non Muhtaat). With out Taqleed, non expert will practice religious acts with out authentic evidence and this is not accepted in Islam.

Wassalam.

Language is never a condition or reason in Taqleed. The conditions of Taqleed are mentioned in the books of Fiqh and in answers of few questions on this website.

Nevertheless, There is one Marja' of Taqleed in Najaf Ashraf who is originally from Pakistan but studied and taught in Najaf Ashraf since mnay decades. His name is Ayatullah Shaikh Basheer Al-Najafi, may Allah grant him and all the Maraaji' long life.

Wassalam.

The Marja' of Taqleed must be the most or one of the most knowledgeable scholars in Islamic knowledge who has:

1. Full understanding of the verses of the Holy Quran with the Hadeeths related to the meaning of Quranic verses.

2. Full understanding of all the Hadeeths from the Prophet (SAWA) and his Holy Progeny (Ahlul Bayt)(AS) including the narrations of different meanings and choosing the meaning which is more authentic.

3. Full understanding of Arabic language which is the language of Quran and Hadeeths. With out full understanding of Arabic language the scholar will not be able to reach full understanding of the meanings of Quranic verses and Hadeeths. 
Many non Arab scholars understand the Arabic language very well but do not speak it fluently due to no practice or little practice. This does not harm their ability to be a Marja'.

4. The ability and the practice of deriving the Islamic rules from its evidence, which is called Ejtihad. The Mujtahid is the highly learned Islamic scholar who is able to derive the Islamic rule of every matter in Shariah from its evidence in the Four Islamic sources which are: Quran, Hadeeth, Aql ( Reason) and Ejmaa'( consensus).

5. The high degree of God fearing (Taqwa) as one of the most crucial conditions of the Marja' of Taqleed as mentioned in the Hadeeth narrated from Imam Al-Askari (AS) ( Wasa'il al-Shia, Vol.18, P.131).

6. Being male born from valid marriage طيب الولادة.

The ability of giving speech in Arabic is not a condition of A Marja' as far as he has the all the above conditions.

Wassalam.

The Marja' Al-A'la is the Marja' who is been followed by majority of the Shia scholars in the Hawzas (Islamic seminaries and religious knowledge centers). Now a days the majority of scholars refer to Ayatullah Al-Udhma Sayyed Ali Al-Sistani is the Marja' al-A'la.

Every Mujtahid acts upon his own verdicts because Taqleed is not on the Mujtahids but on the public.

Wassalam.

The main four Marja's in Najaf Ashraf are:

1. Aytullah Seestani who is followed by the majority of the Shia Muslims all over the world.

2. Ayatullah Sayyed Mohammad Saeed al-Hakeem.

3. Ayatullah Shaikh Eshaq al-Fayadh.

4. Ayatullah Shaikh Basheer al-Najafi.

The Marja' who is been followed by the majority of the Shia is called ( Al-Marja al-A'la) ( The highest Marja).

We have a system of our religious leadership based on highest degree of knowledge and piousness, which is quite different from Vatican.

Wassalam.

The Marja' of Taqleed does not come through election, selection nor appointment. He reaches to this status of knowledge by his own hard work and dedication and sincerity with the help of Allah (SWT). The scholars in the Hawza are the responsible persons to identify and recognize the level of knowledge of the Mujtahid scholar and whether he is entitled to be Marja' or not. Such high level of scholars give witness that this Mujtahid is a Marje' then people can do his Taqleed.

Wassalam.