Khullar also holds a Master of Public Administration degree from GRIPS, Tokyo, Japan and an Executive Development Program diploma from Harvard Kennedy School.

[5][29][30] In Haryana, Khullar inspired farmers to conserve water, promoted the use of digital governance tools, and designed schemes to curb female foeticide.

[34] He chaired the World Bank Group's Committee on Development Effectiveness (CODE) and was a member of the Global Environment Facility council, where he represented Nepal and Maldives in addition to India, Bangladesh, Bhutan and Sri Lanka.

[35][36] As executive director, Khullar instituted a new policy for the Compliance Advisor Ombudsman to strengthen environmental and social accountability for the International Finance Corporation and Multilateral Investment Guarantee Agency.

[39][40][41] In 2009, Khullar was conferred an Award of Excellence under Jawaharlal Nehru National Urban Renewal Mission (JNNURM) for creating India's first social safety umbrella which included savings accounts, insurance, public conveniences and night shelters.

[42] In 2011, Khullar was recognized for developing Aravali Biodiversity Park, Gurgaon, which was declared India's first OECM (Other Effective Conservation Measures) site in February 2022.