See Part II of the 2012 30 Under 40 Slideshow here and Part III here.

For the complete 2012 30 Under 40 list, see Ascending the Corporate Ladder. For last year's list, see Ready to Take Charge.

David Calabria 
38 
Assistant treasurer & VP 
Avis Budget Group

Calabria led the creation and implementation of an international treasury clearinghouse that allows the $7 billion car rental company to move cash in a tax-efficient manner among its overseas units. He's also instrumental in securing financing for the company's fleet in various countries. Prior to joining Avis, he worked at JPMorgan Chase and PricewaterhouseCoopers. Calabria has a B.B.A. in accounting from the University of Notre Dame.

Hui-Chien Chang 
38 
Director of portfolio management  
Google

Chang has led many projects related to Google's rapidly growing investment program, including a project to hedge the FX risk associated with holdings of sovereign securities and the implementation of several portfolio management systems. She has a B.A. in statistics from Fu-Jen University in Taiwan, an M.S. in statistics and operational research from NYU Stern School of Business and an M.B.A. from the University of Washington.

Christopher Chapman 
38 
VP, global finance 
Diebold

As vice president of global finance for the $2.8 billion maker of banking and security systems, Chapman has financial oversight of Diebold's global operations, its global supply chain and global financial planning and analysis. Since joining Diebold in 1996, he has served in various finance positions, including controller for international operations. Chapman has a B.S.B.A. in finance and an M.B.A. in international business from the University of Akron

Jonathan Cowan 
34 
National manager, rate desk & derivatives 
Toyota Financial Services

Cowan manages Toyota Financial's structured finance program and a portfolio of more than $90 billion in derivatives it uses to hedge interest-rate and currency risk. He successfully implemented a new collateral program that reduced Toyota Financial's counterparty credit risk by more than $1.3 billion. Cowan has a B.S. in economics and computer science from Duke University and an M.B.A. from the USC Marshall School of Business.

Andrew Finkelstein 
35 
Executive director of finance, services division 
Dell

Finkelstein led the benchmarking and conversion to support a new "line of business" model within Dell's $8.3 billion services division. He joined Dell in 2009 when it acquired Perot Systems, and was involved in integrating that acquisition. He had worked at Perot Systems for nine years. Finkelstein has a B.S. in economics and finance from the University of Texas and a J.D. from Southern Methodist University.

Jeffrey Hackman 
34 
Chief accounting officer & VP 
Kforce

Hackman joined Kforce, a $1 billion staffing firm, in 2007, and served as its SEC reporting director before being named to his current position in 2009. He has been actively involved in several of the company's acquisitions and divestitures. Earlier, Hackman worked at Grant Thornton and Arthur Andersen. He has a B.S. in accounting and an master's of accountancy from the University of South Florida.

Tahreem Kampton 
36 
Senior director, FX, commodities & global cash management 
Microsoft

At $73.7 billion Microsoft, Kampton leads treasury's efforts to steward the company's roughly $70 billion in investment assets and hedge financial risks for its overseas revenue of about $20 billion. Since joining Microsoft in 1999, Kampton has taken on tasks such as managing the equity portfolio and developing and implementing dilution management strategies. He has a B.S. in finance from Penn State.

David Kennedy 
35 
Executive director, mergers & acquisitions finance 
Dell

Kennedy leads $62.1 billion Dell's finance integration and work stream efforts for mergers and acquisitions. He has led the financial integration of six acquisitions for the company, while also managing Dell's IT finance portfolio. In his 14 years at Dell, he has also headed finance for the global consumer finances unit. Kennedy has a bachelor's in business studies from the University of Limerick in Ireland.

Alfred Kibe 
38 
Director, capital planning & pensions funding 
General Motors

Kibe led negotiations on the automaker's recent $26 billion pension risk transfer to Prudential Insurance, an effort that involved a team of 50. Earlier, as manager for auto finance, he developed GM's auto finance strategy. Kibe joined GM's treasurer's office in 2005. He has a B.S. in electrical and electronic engineering from the University of Nairobi and an M.B.A. from Wharton.