A lawyer, Winifred has practiced with law firm Gadens since November of 1988. She was admitted to the partnership in 1993 and promoted to managing partner in 1999. She is presently the senior partner in a corporate advisory role
Winifred is a non executive director on a number of companies including; Steamships Trading Company and Newcrest Mining Limited both of which are dual listed on the Port Moresby Stock Exchange and the Australian Stock Exchange; the ANZ Banking Group (PNG) Limited and Post Courier Limited. She is also a Council member on the Institute of National Affairs and a Director of Anglicare PNG In.
She had previously served as a director of New Britain Palm Oil and Lihir Gold Limited, President of the Papua New Guinea Business Council and President of the PNG Institute Of Directors.
In June 2006, Winifred was awarded the Commander of the British Empire medal by Her Majesty the Queen for service to law, commerce and public administration. Winifred is a Fellow of the PNG Institute of Company Directors, a member of the PNG Law Society and Patron of the Business Coalition For Women.