He has been a leading US tax and private client lawyer for over 10 years. He acts as a trusted advisor to a number of high net worth individuals, family offices and fund principals with a primary focus on US tax and cross-border issues that may arise. Timothy also assists clients on a broad range of issues including relinquishing US citizenship, pre-US immigration tax planning, family wealth structuring, structuring for inbound US investments, and addressing historic non-US tax compliance issues.

Timothy has been quoted in the media numerous times (including South China Morning Post, Financial Times and The Wall Street Journal) in relation to various US federal tax issues. In addition, Timothy is a regular speaker at many wealth planning conferences in Asia. He is named as a leading individual for private client/wealth management in Chambers HNW 2020-2021. His clients describe him as a lawyer who "gives all the options and researches all the work before [making] any decisions. He gives a lot of attention to detail and makes sure that any actions [his clients do] will have better long-term outcomes". Furthermore, he has won a number of industry awards (ie. Citywealth and WealthBriefingAsia).