He went to G.S.S Shendam where he obtained his O’ Level Certificate in 1982, and thereafter, went to S.P.S Keffi where he obtained IJMB in 1986. This enabled him to study Law at the Ahmadu Bello University (ABU), Zaria and graduated with a Bachelor of Law degree in 1990.
He was at the Nigerian Law School, Lagos, where he had his one year compulsory studies and was called to bar in 1991. He thereafter, went to University of Jos for post graduate studies, obtaining a Masters Degree in Law(LLM) in 1986.
Lalong started his legal practice in 1992 with the prestigious T- Obot & Co. Legal Practitioners, Jos. This he did soon after serving the mandatory National Youth Service Corp (NYSC) in the Legal Unit of FCDA Abuja. He also worked with Victor Fomwul & Co. Jos from 1997- 1999 as a Managing Partner. He later established his own chambers and was the Principal Partner of Simon B. Lalong & Co. Legal Practitioners.
In 1999, he harkened to the call of the people of Shendam constituency to contest into the state House of Assembly, which he won with a landslide victory under the platform of the PDP (a party he took part in its formation in Shendam L.G.A.). He was subsequently made the Speaker of the State House of Assembly in October 2000.
As a Speaker, Lalong’s rare leadership qualities earned him the record of the longest serving Speaker in the history of Plateau state legislature (2000 – 2006 i.e seven years of unbroken quality leadership).
Also, while serving as a Speaker, his leadership qualities endeared him to all his fellow Speakers across the 36 states in Nigeria who elected him twice as; Chairman, Nigerian Conference of Speakers (i.e. forum of all the 36 Speakers of the federation) from 2001- 2002. He was the National Chairman, forum of All former Speakers of Nigeria and also Chairman of former State Legislators, Plateau State Chapter.
Lalong’s outstanding qualities also made him to win the 1999 and 2003 elections into the State House of Assembly representing Shendam Constituency. As a Member and a Speaker who has served longer than those before and after him (at least as at date), he is proud to be associated with the following landmark enactments leading to: the Establishment of Plateau State University (now Solomon Lar University) Bokkos, Establishment of College of Agriculture Garkawa, Establishment of College of Arts, Science and Remedial Studies, Kurgwi, Creation of additional/new chiefdoms and districts, Creation of additional State Wards, Private Bill on establishment of structures in Local Govt. Councils.
Simon Bako Lalong contested for the Governorship in Plateau state in the April 2015 elections under the Platform of the All Progressive Congress(APC) and won.