[1] He founded 6 tech companies in the USA, delivered two IPOs[2] and is the longest serving CEO of the CSIRO, departing June 2023.

[10] He was Australian Top 10 Digital Entrepreneur,[11] one of Australia's 10 most influential people in Tech,[12] an inaugural STEM Champion of Change,[13] & co-founded the following startups & VC Funds: Light Solutions (CEO) invented semiconductor green laser curing blindness in diabetics, merger with Iris Medical created Iridex IPO’d on Nasdaq.

[14] Iriderm invented laser to treat Telangiectasia, was acquired by Nasdaq:CUTR[15] AOC (Chair) created Optoelectronics for Cable TV, now public company in China[16] Translucent (CEO, Chair) invented Silicon laser, acquired by ASX:SLX, share price rose 10x post acquisition.

[17] Lightbit (CEO) invented optical chip enabling Telecom across USA in a single span, acquired by Corelux.

[37][38] In 2016, CSIRO deployed a water detection device as described by Marshall, and mapped underground aquifers, but the Australian Skeptics refused to withdraw their award.

[39] His narrowing of CSIRO’s focus required a 350 person reduction, including 60 climate scientists which drew intense criticism from scientists & the Australian Labor Party, & Greens,[40] including:[41][42] 3,000 signature petition from scientists across 60 countries[43] 7 senate hearings[44][45] Editorial in New York Times titled “Australia turns its back on climate science”[46][47] 50+ articles by Peter Hannam criticizing the changes[48] 2016 election promise by Labor to reverse Marshall’s changes[49] Intense Public criticism of Marshall by famous scientists John Church,[50] Tony Haymet,[51] Andy Pitman,[52] and Senators Kim Carr, Janet Rice, Whish-Wilson said his position was "untenable", "his strategy failed", and he was "going down in flames".